Finding the Fourth Proportional to 7,499.20, 11,250.15 and 3,117.10

Step by Step Solution

1. Step 1: Write the proportion equation
   7,499.20 : 11,250.15 = 3,117.10 : x
2. Step 2: Convert to fraction form
   7,499.20/11,250.15 = 3,117.10/x
3. Step 3: Cross multiply
   7,499.20x = 11,250.15 × 3,117.10
4. Step 4: Simplify right side
   7,499.20x = 35,067,842.57
5. Step 5: Solve for x
   x = 35,067,842.57/7,499.20
6. Step 6: Final answer
   x = 4,676.21