Finding the Fourth Proportional to 16,985.76, 23,439.89 and 9,431.87

Step by Step Solution

1. Step 1: Write the proportion equation
   16,985.76 : 23,439.89 = 9,431.87 : x
2. Step 2: Convert to fraction form
   16,985.76/23,439.89 = 9,431.87/x
3. Step 3: Cross multiply
   16,985.76x = 23,439.89 × 9,431.87
4. Step 4: Simplify right side
   16,985.76x = 221,081,830.94
5. Step 5: Solve for x
   x = 221,081,830.94/16,985.76
6. Step 6: Final answer
   x = 13,015.72