Finding the Fourth Proportional to 16,961.88, 23,405.90 and 9,888.96

Step by Step Solution

1. Step 1: Write the proportion equation
   16,961.88 : 23,405.90 = 9,888.96 : x
2. Step 2: Convert to fraction form
   16,961.88/23,405.90 = 9,888.96/x
3. Step 3: Cross multiply
   16,961.88x = 23,405.90 × 9,888.96
4. Step 4: Simplify right side
   16,961.88x = 231,460,008.86
5. Step 5: Solve for x
   x = 231,460,008.86/16,961.88
6. Step 6: Final answer
   x = 13,645.89