Finding the Fourth Proportional to 20,947.52, 31,416.72 and 7,440.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,947.52 : 31,416.72 = 7,440.50 : x
2. Step 2: Convert to fraction form
   20,947.52/31,416.72 = 7,440.50/x
3. Step 3: Cross multiply
   20,947.52x = 31,416.72 × 7,440.50
4. Step 4: Simplify right side
   20,947.52x = 233,756,105.16
5. Step 5: Solve for x
   x = 233,756,105.16/20,947.52
6. Step 6: Final answer
   x = 11,159.13