Finding the Fourth Proportional to 42,568.92, 63,863.72 and 12,987.28

Step by Step Solution

1. Step 1: Write the proportion equation
   42,568.92 : 63,863.72 = 12,987.28 : x
2. Step 2: Convert to fraction form
   42,568.92/63,863.72 = 12,987.28/x
3. Step 3: Cross multiply
   42,568.92x = 63,863.72 × 12,987.28
4. Step 4: Simplify right side
   42,568.92x = 829,416,013.48
5. Step 5: Solve for x
   x = 829,416,013.48/42,568.92
6. Step 6: Final answer
   x = 19,484.07