Finding the Fourth Proportional to 16,780.69, 23,123.23 and 12,980.78

Step by Step Solution

1. Step 1: Write the proportion equation
   16,780.69 : 23,123.23 = 12,980.78 : x
2. Step 2: Convert to fraction form
   16,780.69/23,123.23 = 12,980.78/x
3. Step 3: Cross multiply
   16,780.69x = 23,123.23 × 12,980.78
4. Step 4: Simplify right side
   16,780.69x = 300,157,561.52
5. Step 5: Solve for x
   x = 300,157,561.52/16,780.69
6. Step 6: Final answer
   x = 17,887.08