Finding the Fourth Proportional to 21,158.10, 31,738.49 and 7,117.02

Step by Step Solution

1. Step 1: Write the proportion equation
   21,158.10 : 31,738.49 = 7,117.02 : x
2. Step 2: Convert to fraction form
   21,158.10/31,738.49 = 7,117.02/x
3. Step 3: Cross multiply
   21,158.10x = 31,738.49 × 7,117.02
4. Step 4: Simplify right side
   21,158.10x = 225,883,468.10
5. Step 5: Solve for x
   x = 225,883,468.10/21,158.10
6. Step 6: Final answer
   x = 10,675.98