Finding the Fourth Proportional to 123,291.05, 170,141.72 and 85,587.17

Step by Step Solution

1. Step 1: Write the proportion equation
   123,291.05 : 170,141.72 = 85,587.17 : x
2. Step 2: Convert to fraction form
   123,291.05/170,141.72 = 85,587.17/x
3. Step 3: Cross multiply
   123,291.05x = 170,141.72 × 85,587.17
4. Step 4: Simplify right side
   123,291.05x = 14,561,947,035.09
5. Step 5: Solve for x
   x = 14,561,947,035.09/123,291.05
6. Step 6: Final answer
   x = 118,110.34