Finding the Fourth Proportional to 86,454.57, 129,697.53 and 42,081.30

Step by Step Solution

1. Step 1: Write the proportion equation
   86,454.57 : 129,697.53 = 42,081.30 : x
2. Step 2: Convert to fraction form
   86,454.57/129,697.53 = 42,081.30/x
3. Step 3: Cross multiply
   86,454.57x = 129,697.53 × 42,081.30
4. Step 4: Simplify right side
   86,454.57x = 5,457,840,669.19
5. Step 5: Solve for x
   x = 5,457,840,669.19/86,454.57
6. Step 6: Final answer
   x = 63,129.58