Finding the Fourth Proportional to 11,721.55, 16,138.27 and 9,490.81

Step by Step Solution

1. Step 1: Write the proportion equation
   11,721.55 : 16,138.27 = 9,490.81 : x
2. Step 2: Convert to fraction form
   11,721.55/16,138.27 = 9,490.81/x
3. Step 3: Cross multiply
   11,721.55x = 16,138.27 × 9,490.81
4. Step 4: Simplify right side
   11,721.55x = 153,165,254.30
5. Step 5: Solve for x
   x = 153,165,254.30/11,721.55
6. Step 6: Final answer
   x = 13,066.98