Finding the Fourth Proportional to 21,111.24, 31,670.10 and 7,257

Step by Step Solution

1. Step 1: Write the proportion equation
   21,111.24 : 31,670.10 = 7,257 : x
2. Step 2: Convert to fraction form
   21,111.24/31,670.10 = 7,257/x
3. Step 3: Cross multiply
   21,111.24x = 31,670.10 × 7,257
4. Step 4: Simplify right side
   21,111.24x = 229,829,915.70
5. Step 5: Solve for x
   x = 229,829,915.70/21,111.24
6. Step 6: Final answer
   x = 10,886.61