Finding the Fourth Proportional to 86,507.28, 129,781.88 and 42,123.93

Step by Step Solution

1. Step 1: Write the proportion equation
   86,507.28 : 129,781.88 = 42,123.93 : x
2. Step 2: Convert to fraction form
   86,507.28/129,781.88 = 42,123.93/x
3. Step 3: Cross multiply
   86,507.28x = 129,781.88 × 42,123.93
4. Step 4: Simplify right side
   86,507.28x = 5,466,922,617.77
5. Step 5: Solve for x
   x = 5,466,922,617.77/86,507.28
6. Step 6: Final answer
   x = 63,196.10