Finding the Fourth Proportional to 21,665.32, 32,491.40 and 9,185.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,665.32 : 32,491.40 = 9,185.12 : x
2. Step 2: Convert to fraction form
   21,665.32/32,491.40 = 9,185.12/x
3. Step 3: Cross multiply
   21,665.32x = 32,491.40 × 9,185.12
4. Step 4: Simplify right side
   21,665.32x = 298,437,407.97
5. Step 5: Solve for x
   x = 298,437,407.97/21,665.32
6. Step 6: Final answer
   x = 13,774.89