Finding the Fourth Proportional to 31,006.86, 42,717.15 and 21,559.02

Step by Step Solution

1. Step 1: Write the proportion equation
   31,006.86 : 42,717.15 = 21,559.02 : x
2. Step 2: Convert to fraction form
   31,006.86/42,717.15 = 21,559.02/x
3. Step 3: Cross multiply
   31,006.86x = 42,717.15 × 21,559.02
4. Step 4: Simplify right side
   31,006.86x = 920,939,891.19
5. Step 5: Solve for x
   x = 920,939,891.19/31,006.86
6. Step 6: Final answer
   x = 29,701.17