Finding the Fourth Proportional to 10,861.07, 14,972.18 and 7,872.17

Step by Step Solution

1. Step 1: Write the proportion equation
   10,861.07 : 14,972.18 = 7,872.17 : x
2. Step 2: Convert to fraction form
   10,861.07/14,972.18 = 7,872.17/x
3. Step 3: Cross multiply
   10,861.07x = 14,972.18 × 7,872.17
4. Step 4: Simplify right side
   10,861.07x = 117,863,432.01
5. Step 5: Solve for x
   x = 117,863,432.01/10,861.07
6. Step 6: Final answer
   x = 10,851.92