Finding the Fourth Proportional to 9,348.20, 12,899.90 and 5,810.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,348.20 : 12,899.90 = 5,810.72 : x
2. Step 2: Convert to fraction form
   9,348.20/12,899.90 = 5,810.72/x
3. Step 3: Cross multiply
   9,348.20x = 12,899.90 × 5,810.72
4. Step 4: Simplify right side
   9,348.20x = 74,957,613.37
5. Step 5: Solve for x
   x = 74,957,613.37/9,348.20
6. Step 6: Final answer
   x = 8,018.40