Finding the Fourth Proportional to 16,430, 22,673.42 and 8,978

Step by Step Solution

1. Step 1: Write the proportion equation
   16,430 : 22,673.42 = 8,978 : x
2. Step 2: Convert to fraction form
   16,430/22,673.42 = 8,978/x
3. Step 3: Cross multiply
   16,430x = 22,673.42 × 8,978
4. Step 4: Simplify right side
   16,430x = 203,561,964.76
5. Step 5: Solve for x
   x = 203,561,964.76/16,430
6. Step 6: Final answer
   x = 12,389.65