Finding the Fourth Proportional to 10,656.15, 15,988.83 and 5,720.02

Step by Step Solution

1. Step 1: Write the proportion equation
   10,656.15 : 15,988.83 = 5,720.02 : x
2. Step 2: Convert to fraction form
   10,656.15/15,988.83 = 5,720.02/x
3. Step 3: Cross multiply
   10,656.15x = 15,988.83 × 5,720.02
4. Step 4: Simplify right side
   10,656.15x = 91,456,425.91
5. Step 5: Solve for x
   x = 91,456,425.91/10,656.15
6. Step 6: Final answer
   x = 8,582.50