Finding the Fourth Proportional to 11,899.86, 17,909.55 and 8,953.59

Step by Step Solution

1. Step 1: Write the proportion equation
   11,899.86 : 17,909.55 = 8,953.59 : x
2. Step 2: Convert to fraction form
   11,899.86/17,909.55 = 8,953.59/x
3. Step 3: Cross multiply
   11,899.86x = 17,909.55 × 8,953.59
4. Step 4: Simplify right side
   11,899.86x = 160,354,767.78
5. Step 5: Solve for x
   x = 160,354,767.78/11,899.86
6. Step 6: Final answer
   x = 13,475.35