Finding the Fourth Proportional to 105,087.78, 157,428.42 and 88,018.11

Step by Step Solution

1. Step 1: Write the proportion equation
   105,087.78 : 157,428.42 = 88,018.11 : x
2. Step 2: Convert to fraction form
   105,087.78/157,428.42 = 88,018.11/x
3. Step 3: Cross multiply
   105,087.78x = 157,428.42 × 88,018.11
4. Step 4: Simplify right side
   105,087.78x = 13,856,551,988.69
5. Step 5: Solve for x
   x = 13,856,551,988.69/105,087.78
6. Step 6: Final answer
   x = 131,856.93