Finding the Fourth Proportional to 42,310.73, 63,453.31 and 12,720.71

Step by Step Solution

1. Step 1: Write the proportion equation
   42,310.73 : 63,453.31 = 12,720.71 : x
2. Step 2: Convert to fraction form
   42,310.73/63,453.31 = 12,720.71/x
3. Step 3: Cross multiply
   42,310.73x = 63,453.31 × 12,720.71
4. Step 4: Simplify right side
   42,310.73x = 807,171,155.05
5. Step 5: Solve for x
   x = 807,171,155.05/42,310.73
6. Step 6: Final answer
   x = 19,077.22