Finding the Fourth Proportional to 5,581.72, 7,700.10 and 3,988.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,581.72 : 7,700.10 = 3,988.72 : x
2. Step 2: Convert to fraction form
   5,581.72/7,700.10 = 3,988.72/x
3. Step 3: Cross multiply
   5,581.72x = 7,700.10 × 3,988.72
4. Step 4: Simplify right side
   5,581.72x = 30,713,542.87
5. Step 5: Solve for x
   x = 30,713,542.87/5,581.72
6. Step 6: Final answer
   x = 5,502.52