Finding the Fourth Proportional to 42,287.91, 63,423.92 and 21,222.29

Step by Step Solution

1. Step 1: Write the proportion equation
   42,287.91 : 63,423.92 = 21,222.29 : x
2. Step 2: Convert to fraction form
   42,287.91/63,423.92 = 21,222.29/x
3. Step 3: Cross multiply
   42,287.91x = 63,423.92 × 21,222.29
4. Step 4: Simplify right side
   42,287.91x = 1,346,000,399.95
5. Step 5: Solve for x
   x = 1,346,000,399.95/42,287.91
6. Step 6: Final answer
   x = 31,829.44