Finding the Fourth Proportional to 21,031.40, 31,545.86 and 7,882.67

Step by Step Solution

1. Step 1: Write the proportion equation
   21,031.40 : 31,545.86 = 7,882.67 : x
2. Step 2: Convert to fraction form
   21,031.40/31,545.86 = 7,882.67/x
3. Step 3: Cross multiply
   21,031.40x = 31,545.86 × 7,882.67
4. Step 4: Simplify right side
   21,031.40x = 248,665,407.10
5. Step 5: Solve for x
   x = 248,665,407.10/21,031.40
6. Step 6: Final answer
   x = 11,823.53