Finding the Fourth Proportional to 42,105.72, 63,147.60 and 12,515.61

Step by Step Solution

1. Step 1: Write the proportion equation
   42,105.72 : 63,147.60 = 12,515.61 : x
2. Step 2: Convert to fraction form
   42,105.72/63,147.60 = 12,515.61/x
3. Step 3: Cross multiply
   42,105.72x = 63,147.60 × 12,515.61
4. Step 4: Simplify right side
   42,105.72x = 790,330,734.04
5. Step 5: Solve for x
   x = 790,330,734.04/42,105.72
6. Step 6: Final answer
   x = 18,770.15