Finding the Fourth Proportional to 7,499.80, 11,256.90 and 3,806.20

Step by Step Solution

1. Step 1: Write the proportion equation
   7,499.80 : 11,256.90 = 3,806.20 : x
2. Step 2: Convert to fraction form
   7,499.80/11,256.90 = 3,806.20/x
3. Step 3: Cross multiply
   7,499.80x = 11,256.90 × 3,806.20
4. Step 4: Simplify right side
   7,499.80x = 42,846,012.78
5. Step 5: Solve for x
   x = 42,846,012.78/7,499.80
6. Step 6: Final answer
   x = 5,712.95