Finding the Fourth Proportional to 12,798.72, 17,656.20 and 7,490.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,798.72 : 17,656.20 = 7,490.28 : x
2. Step 2: Convert to fraction form
   12,798.72/17,656.20 = 7,490.28/x
3. Step 3: Cross multiply
   12,798.72x = 17,656.20 × 7,490.28
4. Step 4: Simplify right side
   12,798.72x = 132,249,881.74
5. Step 5: Solve for x
   x = 132,249,881.74/12,798.72
6. Step 6: Final answer
   x = 10,333.06