Finding the Fourth Proportional to 86,411.40, 129,587.40 and 42,009.54

Step by Step Solution

1. Step 1: Write the proportion equation
   86,411.40 : 129,587.40 = 42,009.54 : x
2. Step 2: Convert to fraction form
   86,411.40/129,587.40 = 42,009.54/x
3. Step 3: Cross multiply
   86,411.40x = 129,587.40 × 42,009.54
4. Step 4: Simplify right side
   86,411.40x = 5,443,907,063.80
5. Step 5: Solve for x
   x = 5,443,907,063.80/86,411.40
6. Step 6: Final answer
   x = 62,999.87