Finding the Fourth Proportional to 137,838,456.10, 206,757,684.15 and 86,820,120.10

Step by Step Solution

1. Step 1: Write the proportion equation
   137,838,456.10 : 206,757,684.15 = 86,820,120.10 : x
2. Step 2: Convert to fraction form
   137,838,456.10/206,757,684.15 = 86,820,120.10/x
3. Step 3: Cross multiply
   137,838,456.10x = 206,757,684.15 × 86,820,120.10
4. Step 4: Simplify right side
   137,838,456.10x = 17,950,726,969,500,866
5. Step 5: Solve for x
   x = 17,950,726,969,500,866/137,838,456.10
6. Step 6: Final answer
   x = 130,230,180.15