Finding the Fourth Proportional to 123,680.94, 185,417.52 and 86,130.15

Step by Step Solution

1. Step 1: Write the proportion equation
   123,680.94 : 185,417.52 = 86,130.15 : x
2. Step 2: Convert to fraction form
   123,680.94/185,417.52 = 86,130.15/x
3. Step 3: Cross multiply
   123,680.94x = 185,417.52 × 86,130.15
4. Step 4: Simplify right side
   123,680.94x = 15,970,038,810.23
5. Step 5: Solve for x
   x = 15,970,038,810.23/123,680.94
6. Step 6: Final answer
   x = 129,122.88