Finding the Fourth Proportional to 10,521.12, 14,520.15 and 7,863.90

Step by Step Solution

1. Step 1: Write the proportion equation
   10,521.12 : 14,520.15 = 7,863.90 : x
2. Step 2: Convert to fraction form
   10,521.12/14,520.15 = 7,863.90/x
3. Step 3: Cross multiply
   10,521.12x = 14,520.15 × 7,863.90
4. Step 4: Simplify right side
   10,521.12x = 114,185,007.59
5. Step 5: Solve for x
   x = 114,185,007.59/10,521.12
6. Step 6: Final answer
   x = 10,852.93