Finding the Fourth Proportional to 31,112.22, 42,921.20 and 21,037.02

Step by Step Solution

1. Step 1: Write the proportion equation
   31,112.22 : 42,921.20 = 21,037.02 : x
2. Step 2: Convert to fraction form
   31,112.22/42,921.20 = 21,037.02/x
3. Step 3: Cross multiply
   31,112.22x = 42,921.20 × 21,037.02
4. Step 4: Simplify right side
   31,112.22x = 902,934,142.82
5. Step 5: Solve for x
   x = 902,934,142.82/31,112.22
6. Step 6: Final answer
   x = 29,021.85