Finding the Fourth Proportional to 103,543.33, 155,087.33 and 85,570.29

Step by Step Solution

1. Step 1: Write the proportion equation
   103,543.33 : 155,087.33 = 85,570.29 : x
2. Step 2: Convert to fraction form
   103,543.33/155,087.33 = 85,570.29/x
3. Step 3: Cross multiply
   103,543.33x = 155,087.33 × 85,570.29
4. Step 4: Simplify right side
   103,543.33x = 13,270,867,201.78
5. Step 5: Solve for x
   x = 13,270,867,201.78/103,543.33
6. Step 6: Final answer
   x = 128,167.29