Finding the Fourth Proportional to 42,264.78, 63,378.45 and 12,672.78

Step by Step Solution

1. Step 1: Write the proportion equation
   42,264.78 : 63,378.45 = 12,672.78 : x
2. Step 2: Convert to fraction form
   42,264.78/63,378.45 = 12,672.78/x
3. Step 3: Cross multiply
   42,264.78x = 63,378.45 × 12,672.78
4. Step 4: Simplify right side
   42,264.78x = 803,181,153.59
5. Step 5: Solve for x
   x = 803,181,153.59/42,264.78
6. Step 6: Final answer
   x = 19,003.56