Finding the Fourth Proportional to 95,559.71, 142,728.50 and 86,540.39

Step by Step Solution

1. Step 1: Write the proportion equation
   95,559.71 : 142,728.50 = 86,540.39 : x
2. Step 2: Convert to fraction form
   95,559.71/142,728.50 = 86,540.39/x
3. Step 3: Cross multiply
   95,559.71x = 142,728.50 × 86,540.39
4. Step 4: Simplify right side
   95,559.71x = 12,351,778,907.77
5. Step 5: Solve for x
   x = 12,351,778,907.77/95,559.71
6. Step 6: Final answer
   x = 129,257.19