Finding the Fourth Proportional to 31,002.86, 42,711.62 and 21,555.02

Step by Step Solution

1. Step 1: Write the proportion equation
   31,002.86 : 42,711.62 = 21,555.02 : x
2. Step 2: Convert to fraction form
   31,002.86/42,711.62 = 21,555.02/x
3. Step 3: Cross multiply
   31,002.86x = 42,711.62 × 21,555.02
4. Step 4: Simplify right side
   31,002.86x = 920,649,823.33
5. Step 5: Solve for x
   x = 920,649,823.33/31,002.86
6. Step 6: Final answer
   x = 29,695.64