Finding the Fourth Proportional to 31,132.14, 42,978.24 and 21,113.52

Step by Step Solution

1. Step 1: Write the proportion equation
   31,132.14 : 42,978.24 = 21,113.52 : x
2. Step 2: Convert to fraction form
   31,132.14/42,978.24 = 21,113.52/x
3. Step 3: Cross multiply
   31,132.14x = 42,978.24 × 21,113.52
4. Step 4: Simplify right side
   31,132.14x = 907,421,929.80
5. Step 5: Solve for x
   x = 907,421,929.80/31,132.14
6. Step 6: Final answer
   x = 29,147.43