Finding the Fourth Proportional to 52,790.72, 79,173.76 and 21,224.10

Step by Step Solution

1. Step 1: Write the proportion equation
   52,790.72 : 79,173.76 = 21,224.10 : x
2. Step 2: Convert to fraction form
   52,790.72/79,173.76 = 21,224.10/x
3. Step 3: Cross multiply
   52,790.72x = 79,173.76 × 21,224.10
4. Step 4: Simplify right side
   52,790.72x = 1,680,391,799.62
5. Step 5: Solve for x
   x = 1,680,391,799.62/52,790.72
6. Step 6: Final answer
   x = 31,831.20