Finding the Fourth Proportional to 10,790.63, 14,899.52 and 8,439.47

Step by Step Solution

1. Step 1: Write the proportion equation
   10,790.63 : 14,899.52 = 8,439.47 : x
2. Step 2: Convert to fraction form
   10,790.63/14,899.52 = 8,439.47/x
3. Step 3: Cross multiply
   10,790.63x = 14,899.52 × 8,439.47
4. Step 4: Simplify right side
   10,790.63x = 125,744,009.86
5. Step 5: Solve for x
   x = 125,744,009.86/10,790.63
6. Step 6: Final answer
   x = 11,653.07