Finding the Fourth Proportional to 8,490.72, 12,731.12 and 5,030.40

Step by Step Solution

1. Step 1: Write the proportion equation
   8,490.72 : 12,731.12 = 5,030.40 : x
2. Step 2: Convert to fraction form
   8,490.72/12,731.12 = 5,030.40/x
3. Step 3: Cross multiply
   8,490.72x = 12,731.12 × 5,030.40
4. Step 4: Simplify right side
   8,490.72x = 64,042,626.05
5. Step 5: Solve for x
   x = 64,042,626.05/8,490.72
6. Step 6: Final answer
   x = 7,542.66