Finding the Fourth Proportional to 31,301.55, 43,202.48 and 21,227.31

Step by Step Solution

1. Step 1: Write the proportion equation
   31,301.55 : 43,202.48 = 21,227.31 : x
2. Step 2: Convert to fraction form
   31,301.55/43,202.48 = 21,227.31/x
3. Step 3: Cross multiply
   31,301.55x = 43,202.48 × 21,227.31
4. Step 4: Simplify right side
   31,301.55x = 917,072,329.59
5. Step 5: Solve for x
   x = 917,072,329.59/31,301.55
6. Step 6: Final answer
   x = 29,297.98