Finding the Fourth Proportional to 8,700.39, 13,057.50 and 3,155.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,700.39 : 13,057.50 = 3,155.31 : x
2. Step 2: Convert to fraction form
   8,700.39/13,057.50 = 3,155.31/x
3. Step 3: Cross multiply
   8,700.39x = 13,057.50 × 3,155.31
4. Step 4: Simplify right side
   8,700.39x = 41,200,460.33
5. Step 5: Solve for x
   x = 41,200,460.33/8,700.39
6. Step 6: Final answer
   x = 4,735.47