Finding the Fourth Proportional to 93,216.72, 139,120.71 and 86,896.29

Step by Step Solution

1. Step 1: Write the proportion equation
   93,216.72 : 139,120.71 = 86,896.29 : x
2. Step 2: Convert to fraction form
   93,216.72/139,120.71 = 86,896.29/x
3. Step 3: Cross multiply
   93,216.72x = 139,120.71 × 86,896.29
4. Step 4: Simplify right side
   93,216.72x = 12,089,073,561.17
5. Step 5: Solve for x
   x = 12,089,073,561.17/93,216.72
6. Step 6: Final answer
   x = 129,687.82