Finding the Fourth Proportional to 86,439.51, 129,674.96 and 42,066.29

Step by Step Solution

1. Step 1: Write the proportion equation
   86,439.51 : 129,674.96 = 42,066.29 : x
2. Step 2: Convert to fraction form
   86,439.51/129,674.96 = 42,066.29/x
3. Step 3: Cross multiply
   86,439.51x = 129,674.96 × 42,066.29
4. Step 4: Simplify right side
   86,439.51x = 5,454,943,614.39
5. Step 5: Solve for x
   x = 5,454,943,614.39/86,439.51
6. Step 6: Final answer
   x = 63,107.06