Finding the Fourth Proportional to 10,191.17, 14,063.54 and 5,715.20

Step by Step Solution

1. Step 1: Write the proportion equation
   10,191.17 : 14,063.54 = 5,715.20 : x
2. Step 2: Convert to fraction form
   10,191.17/14,063.54 = 5,715.20/x
3. Step 3: Cross multiply
   10,191.17x = 14,063.54 × 5,715.20
4. Step 4: Simplify right side
   10,191.17x = 80,375,844.91
5. Step 5: Solve for x
   x = 80,375,844.91/10,191.17
6. Step 6: Final answer
   x = 7,886.82