Finding the Fourth Proportional to 11,404.96, 15,726.51 and 9,899.98

Step by Step Solution

1. Step 1: Write the proportion equation
   11,404.96 : 15,726.51 = 9,899.98 : x
2. Step 2: Convert to fraction form
   11,404.96/15,726.51 = 9,899.98/x
3. Step 3: Cross multiply
   11,404.96x = 15,726.51 × 9,899.98
4. Step 4: Simplify right side
   11,404.96x = 155,692,134.47
5. Step 5: Solve for x
   x = 155,692,134.47/11,404.96
6. Step 6: Final answer
   x = 13,651.27