Finding the Fourth Proportional to 86,440.10, 129,608.71 and 42,022.13

Step by Step Solution

1. Step 1: Write the proportion equation
   86,440.10 : 129,608.71 = 42,022.13 : x
2. Step 2: Convert to fraction form
   86,440.10/129,608.71 = 42,022.13/x
3. Step 3: Cross multiply
   86,440.10x = 129,608.71 × 42,022.13
4. Step 4: Simplify right side
   86,440.10x = 5,446,433,307.65
5. Step 5: Solve for x
   x = 5,446,433,307.65/86,440.10
6. Step 6: Final answer
   x = 63,008.18