Finding the Fourth Proportional to 102,993.12, 142,018.11 and 89,444.79

Step by Step Solution

1. Step 1: Write the proportion equation
   102,993.12 : 142,018.11 = 89,444.79 : x
2. Step 2: Convert to fraction form
   102,993.12/142,018.11 = 89,444.79/x
3. Step 3: Cross multiply
   102,993.12x = 142,018.11 × 89,444.79
4. Step 4: Simplify right side
   102,993.12x = 12,702,780,025.15
5. Step 5: Solve for x
   x = 12,702,780,025.15/102,993.12
6. Step 6: Final answer
   x = 123,336.20