Finding the Fourth Proportional to 21,153.60, 31,724.22 and 7,112.04

Step by Step Solution

1. Step 1: Write the proportion equation
   21,153.60 : 31,724.22 = 7,112.04 : x
2. Step 2: Convert to fraction form
   21,153.60/31,724.22 = 7,112.04/x
3. Step 3: Cross multiply
   21,153.60x = 31,724.22 × 7,112.04
4. Step 4: Simplify right side
   21,153.60x = 225,623,921.61
5. Step 5: Solve for x
   x = 225,623,921.61/21,153.60
6. Step 6: Final answer
   x = 10,665.98