Finding the Fourth Proportional to 31,580.52, 43,570.98 and 20,972.28

Step by Step Solution

1. Step 1: Write the proportion equation
   31,580.52 : 43,570.98 = 20,972.28 : x
2. Step 2: Convert to fraction form
   31,580.52/43,570.98 = 20,972.28/x
3. Step 3: Cross multiply
   31,580.52x = 43,570.98 × 20,972.28
4. Step 4: Simplify right side
   31,580.52x = 913,782,792.43
5. Step 5: Solve for x
   x = 913,782,792.43/31,580.52
6. Step 6: Final answer
   x = 28,935.01