Finding the Fourth Proportional to 102,819.16, 141,575.01 and 90,000.61

Step by Step Solution

1. Step 1: Write the proportion equation
   102,819.16 : 141,575.01 = 90,000.61 : x
2. Step 2: Convert to fraction form
   102,819.16/141,575.01 = 90,000.61/x
3. Step 3: Cross multiply
   102,819.16x = 141,575.01 × 90,000.61
4. Step 4: Simplify right side
   102,819.16x = 12,741,836,569.32
5. Step 5: Solve for x
   x = 12,741,836,569.32/102,819.16
6. Step 6: Final answer
   x = 123,924.73