Finding the Fourth Proportional to 42,481.46, 63,718.06 and 12,899.55

Step by Step Solution

1. Step 1: Write the proportion equation
   42,481.46 : 63,718.06 = 12,899.55 : x
2. Step 2: Convert to fraction form
   42,481.46/63,718.06 = 12,899.55/x
3. Step 3: Cross multiply
   42,481.46x = 63,718.06 × 12,899.55
4. Step 4: Simplify right side
   42,481.46x = 821,934,300.87
5. Step 5: Solve for x
   x = 821,934,300.87/42,481.46
6. Step 6: Final answer
   x = 19,348.07