Finding the Fourth Proportional to 16,565.40, 22,868.71 and 12,780.07

Step by Step Solution

1. Step 1: Write the proportion equation
   16,565.40 : 22,868.71 = 12,780.07 : x
2. Step 2: Convert to fraction form
   16,565.40/22,868.71 = 12,780.07/x
3. Step 3: Cross multiply
   16,565.40x = 22,868.71 × 12,780.07
4. Step 4: Simplify right side
   16,565.40x = 292,263,714.61
5. Step 5: Solve for x
   x = 292,263,714.61/16,565.40
6. Step 6: Final answer
   x = 17,643.02