Finding the Fourth Proportional to 16,978.56, 23,430.38 and 9,424.98

Step by Step Solution

1. Step 1: Write the proportion equation
   16,978.56 : 23,430.38 = 9,424.98 : x
2. Step 2: Convert to fraction form
   16,978.56/23,430.38 = 9,424.98/x
3. Step 3: Cross multiply
   16,978.56x = 23,430.38 × 9,424.98
4. Step 4: Simplify right side
   16,978.56x = 220,830,815.77
5. Step 5: Solve for x
   x = 220,830,815.77/16,978.56
6. Step 6: Final answer
   x = 13,006.45