Finding the Fourth Proportional to 123,681.94, 185,419.02 and 86,131.15

Step by Step Solution

1. Step 1: Write the proportion equation
   123,681.94 : 185,419.02 = 86,131.15 : x
2. Step 2: Convert to fraction form
   123,681.94/185,419.02 = 86,131.15/x
3. Step 3: Cross multiply
   123,681.94x = 185,419.02 × 86,131.15
4. Step 4: Simplify right side
   123,681.94x = 15,970,353,424.47
5. Step 5: Solve for x
   x = 15,970,353,424.47/123,681.94
6. Step 6: Final answer
   x = 129,124.38