Finding the Fourth Proportional to 86,443.39, 129,669.13 and 42,017.18

Step by Step Solution

1. Step 1: Write the proportion equation
   86,443.39 : 129,669.13 = 42,017.18 : x
2. Step 2: Convert to fraction form
   86,443.39/129,669.13 = 42,017.18/x
3. Step 3: Cross multiply
   86,443.39x = 129,669.13 × 42,017.18
4. Step 4: Simplify right side
   86,443.39x = 5,448,331,175.65
5. Step 5: Solve for x
   x = 5,448,331,175.65/86,443.39
6. Step 6: Final answer
   x = 63,027.74