Finding the Fourth Proportional to 13,031.28, 17,987.54 and 8,123.63

Step by Step Solution

1. Step 1: Write the proportion equation
   13,031.28 : 17,987.54 = 8,123.63 : x
2. Step 2: Convert to fraction form
   13,031.28/17,987.54 = 8,123.63/x
3. Step 3: Cross multiply
   13,031.28x = 17,987.54 × 8,123.63
4. Step 4: Simplify right side
   13,031.28x = 146,123,989.01
5. Step 5: Solve for x
   x = 146,123,989.01/13,031.28
6. Step 6: Final answer
   x = 11,213.33