Finding the Fourth Proportional to 172,899.16, 258,881.10 and 89,618.20

Step by Step Solution

1. Step 1: Write the proportion equation
   172,899.16 : 258,881.10 = 89,618.20 : x
2. Step 2: Convert to fraction form
   172,899.16/258,881.10 = 89,618.20/x
3. Step 3: Cross multiply
   172,899.16x = 258,881.10 × 89,618.20
4. Step 4: Simplify right side
   172,899.16x = 23,200,458,196.02
5. Step 5: Solve for x
   x = 23,200,458,196.02/172,899.16
6. Step 6: Final answer
   x = 134,184.91