Finding the Fourth Proportional to 16,978.95, 23,430.75 and 9,425.34

Step by Step Solution

1. Step 1: Write the proportion equation
   16,978.95 : 23,430.75 = 9,425.34 : x
2. Step 2: Convert to fraction form
   16,978.95/23,430.75 = 9,425.34/x
3. Step 3: Cross multiply
   16,978.95x = 23,430.75 × 9,425.34
4. Step 4: Simplify right side
   16,978.95x = 220,842,785.21
5. Step 5: Solve for x
   x = 220,842,785.21/16,978.95
6. Step 6: Final answer
   x = 13,006.86