Finding the Fourth Proportional to 10,890.76, 14,991.32 and 9,491.08

Step by Step Solution

1. Step 1: Write the proportion equation
   10,890.76 : 14,991.32 = 9,491.08 : x
2. Step 2: Convert to fraction form
   10,890.76/14,991.32 = 9,491.08/x
3. Step 3: Cross multiply
   10,890.76x = 14,991.32 × 9,491.08
4. Step 4: Simplify right side
   10,890.76x = 142,283,817.43
5. Step 5: Solve for x
   x = 142,283,817.43/10,890.76
6. Step 6: Final answer
   x = 13,064.64