Finding the Fourth Proportional to 102,815.65, 141,570.17 and 89,997.10

Step by Step Solution

1. Step 1: Write the proportion equation
   102,815.65 : 141,570.17 = 89,997.10 : x
2. Step 2: Convert to fraction form
   102,815.65/141,570.17 = 89,997.10/x
3. Step 3: Cross multiply
   102,815.65x = 141,570.17 × 89,997.10
4. Step 4: Simplify right side
   102,815.65x = 12,740,904,038.66
5. Step 5: Solve for x
   x = 12,740,904,038.66/102,815.65
6. Step 6: Final answer
   x = 123,919.89