Finding the Third Proportional to 5,423,187 and 8,190,360

Step by Step Solution

1. Step 1: Write the proportion equation
   5,423,187 : 8,190,360 = 8,190,360 : x
2. Step 2: Convert to fraction form
   5,423,187/8,190,360 = 8,190,360/x
3. Step 3: Cross multiply
   5,423,187x = 8,190,360 × 8,190,360
4. Step 4: Simplify right side
   5,423,187x = 67,081,996,929,600
5. Step 5: Solve for x
   x = 67,081,996,929,600/5,423,187
6. Step 6: Final answer
   x = 12,369,478.86