Finding the Fourth Proportional to 42,256.18, 63,380.48 and 12,680.62

Step by Step Solution

1. Step 1: Write the proportion equation
   42,256.18 : 63,380.48 = 12,680.62 : x
2. Step 2: Convert to fraction form
   42,256.18/63,380.48 = 12,680.62/x
3. Step 3: Cross multiply
   42,256.18x = 63,380.48 × 12,680.62
4. Step 4: Simplify right side
   42,256.18x = 803,703,782.30
5. Step 5: Solve for x
   x = 803,703,782.30/42,256.18
6. Step 6: Final answer
   x = 19,019.79