Finding the Fourth Proportional to 16,961.06, 23,405.72 and 9,887.78

Step by Step Solution

1. Step 1: Write the proportion equation
   16,961.06 : 23,405.72 = 9,887.78 : x
2. Step 2: Convert to fraction form
   16,961.06/23,405.72 = 9,887.78/x
3. Step 3: Cross multiply
   16,961.06x = 23,405.72 × 9,887.78
4. Step 4: Simplify right side
   16,961.06x = 231,430,610.10
5. Step 5: Solve for x
   x = 231,430,610.10/16,961.06
6. Step 6: Final answer
   x = 13,644.82