Finding the Third Proportional to 78,090,428,820 and 109,968,531,580

Step by Step Solution

1. Step 1: Write the proportion equation
   78,090,428,820 : 109,968,531,580 = 109,968,531,580 : x
2. Step 2: Convert to fraction form
   78,090,428,820/109,968,531,580 = 109,968,531,580/x
3. Step 3: Cross multiply
   78,090,428,820x = 109,968,531,580 × 109,968,531,580
4. Step 4: Simplify right side
   78,090,428,820x = 12,093,077,937,861,456,560,128
5. Step 5: Solve for x
   x = 12,093,077,937,861,456,560,128/78,090,428,820
6. Step 6: Final answer
   x = 154,859,924,840.93