Finding the Fourth Proportional to 42,458.07, 63,687.27 and 12,876.15

Step by Step Solution

1. Step 1: Write the proportion equation
   42,458.07 : 63,687.27 = 12,876.15 : x
2. Step 2: Convert to fraction form
   42,458.07/63,687.27 = 12,876.15/x
3. Step 3: Cross multiply
   42,458.07x = 63,687.27 × 12,876.15
4. Step 4: Simplify right side
   42,458.07x = 820,046,841.61
5. Step 5: Solve for x
   x = 820,046,841.61/42,458.07
6. Step 6: Final answer
   x = 19,314.28