Finding the Fourth Proportional to 21,156.18, 31,735.85 and 7,116.24

Step by Step Solution

1. Step 1: Write the proportion equation
   21,156.18 : 31,735.85 = 7,116.24 : x
2. Step 2: Convert to fraction form
   21,156.18/31,735.85 = 7,116.24/x
3. Step 3: Cross multiply
   21,156.18x = 31,735.85 × 7,116.24
4. Step 4: Simplify right side
   21,156.18x = 225,839,925.20
5. Step 5: Solve for x
   x = 225,839,925.20/21,156.18
6. Step 6: Final answer
   x = 10,674.89