Finding the Fourth Proportional to 10,991.55, 15,159.96 and 9,461.08

Step by Step Solution

1. Step 1: Write the proportion equation
   10,991.55 : 15,159.96 = 9,461.08 : x
2. Step 2: Convert to fraction form
   10,991.55/15,159.96 = 9,461.08/x
3. Step 3: Cross multiply
   10,991.55x = 15,159.96 × 9,461.08
4. Step 4: Simplify right side
   10,991.55x = 143,429,594.36
5. Step 5: Solve for x
   x = 143,429,594.36/10,991.55
6. Step 6: Final answer
   x = 13,049.08