Finding the Fourth Proportional to 20,670.24, 31,002.12 and 7,520.72

Step by Step Solution

1. Step 1: Write the proportion equation
   20,670.24 : 31,002.12 = 7,520.72 : x
2. Step 2: Convert to fraction form
   20,670.24/31,002.12 = 7,520.72/x
3. Step 3: Cross multiply
   20,670.24x = 31,002.12 × 7,520.72
4. Step 4: Simplify right side
   20,670.24x = 233,158,263.93
5. Step 5: Solve for x
   x = 233,158,263.93/20,670.24
6. Step 6: Final answer
   x = 11,279.90