Finding the Fourth Proportional to 42,353.96, 63,531.04 and 12,780.28

Step by Step Solution

1. Step 1: Write the proportion equation
   42,353.96 : 63,531.04 = 12,780.28 : x
2. Step 2: Convert to fraction form
   42,353.96/63,531.04 = 12,780.28/x
3. Step 3: Cross multiply
   42,353.96x = 63,531.04 × 12,780.28
4. Step 4: Simplify right side
   42,353.96x = 811,944,479.89
5. Step 5: Solve for x
   x = 811,944,479.89/42,353.96
6. Step 6: Final answer
   x = 19,170.45