Finding the Fourth Proportional to 31,010.52, 42,814.29 and 20,418.42

Step by Step Solution

1. Step 1: Write the proportion equation
   31,010.52 : 42,814.29 = 20,418.42 : x
2. Step 2: Convert to fraction form
   31,010.52/42,814.29 = 20,418.42/x
3. Step 3: Cross multiply
   31,010.52x = 42,814.29 × 20,418.42
4. Step 4: Simplify right side
   31,010.52x = 874,200,155.22
5. Step 5: Solve for x
   x = 874,200,155.22/31,010.52
6. Step 6: Final answer
   x = 28,190.44