Finding the Fourth Proportional to 42,456.40, 63,672.45 and 12,867.10

Step by Step Solution

1. Step 1: Write the proportion equation
   42,456.40 : 63,672.45 = 12,867.10 : x
2. Step 2: Convert to fraction form
   42,456.40/63,672.45 = 12,867.10/x
3. Step 3: Cross multiply
   42,456.40x = 63,672.45 × 12,867.10
4. Step 4: Simplify right side
   42,456.40x = 819,279,781.40
5. Step 5: Solve for x
   x = 819,279,781.40/42,456.40
6. Step 6: Final answer
   x = 19,296.97