Finding the Fourth Proportional to 17,311.86, 25,947.18 and 9,921.42

Step by Step Solution

1. Step 1: Write the proportion equation
   17,311.86 : 25,947.18 = 9,921.42 : x
2. Step 2: Convert to fraction form
   17,311.86/25,947.18 = 9,921.42/x
3. Step 3: Cross multiply
   17,311.86x = 25,947.18 × 9,921.42
4. Step 4: Simplify right side
   17,311.86x = 257,432,870.60
5. Step 5: Solve for x
   x = 257,432,870.60/17,311.86
6. Step 6: Final answer
   x = 14,870.32