Finding the Fourth Proportional to 103,431.89, 142,687.18 and 88,485.12

Step by Step Solution

1. Step 1: Write the proportion equation
   103,431.89 : 142,687.18 = 88,485.12 : x
2. Step 2: Convert to fraction form
   103,431.89/142,687.18 = 88,485.12/x
3. Step 3: Cross multiply
   103,431.89x = 142,687.18 × 88,485.12
4. Step 4: Simplify right side
   103,431.89x = 12,625,692,355.37
5. Step 5: Solve for x
   x = 12,625,692,355.37/103,431.89
6. Step 6: Final answer
   x = 122,067.69