Finding the Fourth Proportional to 7,200.86, 9,938.48 and 5,720.10

Step by Step Solution

1. Step 1: Write the proportion equation
   7,200.86 : 9,938.48 = 5,720.10 : x
2. Step 2: Convert to fraction form
   7,200.86/9,938.48 = 5,720.10/x
3. Step 3: Cross multiply
   7,200.86x = 9,938.48 × 5,720.10
4. Step 4: Simplify right side
   7,200.86x = 56,849,070.85
5. Step 5: Solve for x
   x = 56,849,070.85/7,200.86
6. Step 6: Final answer
   x = 7,894.77