Finding the Third Proportional to 78,639,842 and 172,396,300

Step by Step Solution

1. Step 1: Write the proportion equation
   78,639,842 : 172,396,300 = 172,396,300 : x
2. Step 2: Convert to fraction form
   78,639,842/172,396,300 = 172,396,300/x
3. Step 3: Cross multiply
   78,639,842x = 172,396,300 × 172,396,300
4. Step 4: Simplify right side
   78,639,842x = 29,720,484,253,690,000
5. Step 5: Solve for x
   x = 29,720,484,253,690,000/78,639,842
6. Step 6: Final answer
   x = 377,931,637.42