Finding the Fourth Proportional to 42,560.17, 63,850.60 and 12,978.53

Step by Step Solution

1. Step 1: Write the proportion equation
   42,560.17 : 63,850.60 = 12,978.53 : x
2. Step 2: Convert to fraction form
   42,560.17/63,850.60 = 12,978.53/x
3. Step 3: Cross multiply
   42,560.17x = 63,850.60 × 12,978.53
4. Step 4: Simplify right side
   42,560.17x = 828,686,862.73
5. Step 5: Solve for x
   x = 828,686,862.73/42,560.17
6. Step 6: Final answer
   x = 19,470.95