Finding the Fourth Proportional to 16,978.32, 23,430.50 and 9,424.78

Step by Step Solution

1. Step 1: Write the proportion equation
   16,978.32 : 23,430.50 = 9,424.78 : x
2. Step 2: Convert to fraction form
   16,978.32/23,430.50 = 9,424.78/x
3. Step 3: Cross multiply
   16,978.32x = 23,430.50 × 9,424.78
4. Step 4: Simplify right side
   16,978.32x = 220,827,307.79
5. Step 5: Solve for x
   x = 220,827,307.79/16,978.32
6. Step 6: Final answer
   x = 13,006.43