Finding the Fourth Proportional to 7,172.91, 9,899.69 and 5,657.00

Step by Step Solution

1. Step 1: Write the proportion equation
   7,172.91 : 9,899.69 = 5,657.00 : x
2. Step 2: Convert to fraction form
   7,172.91/9,899.69 = 5,657.00/x
3. Step 3: Cross multiply
   7,172.91x = 9,899.69 × 5,657.00
4. Step 4: Simplify right side
   7,172.91x = 56,002,468.55
5. Step 5: Solve for x
   x = 56,002,468.55/7,172.91
6. Step 6: Final answer
   x = 7,807.50