Finding the Fourth Proportional to 42,460.82, 63,691.38 and 12,878.91

Step by Step Solution

1. Step 1: Write the proportion equation
   42,460.82 : 63,691.38 = 12,878.91 : x
2. Step 2: Convert to fraction form
   42,460.82/63,691.38 = 12,878.91/x
3. Step 3: Cross multiply
   42,460.82x = 63,691.38 × 12,878.91
4. Step 4: Simplify right side
   42,460.82x = 820,275,550.80
5. Step 5: Solve for x
   x = 820,275,550.80/42,460.82
6. Step 6: Final answer
   x = 19,318.41