Finding the Fourth Proportional to 42,106.72, 63,149.10 and 12,516.61

Step by Step Solution

1. Step 1: Write the proportion equation
   42,106.72 : 63,149.10 = 12,516.61 : x
2. Step 2: Convert to fraction form
   42,106.72/63,149.10 = 12,516.61/x
3. Step 3: Cross multiply
   42,106.72x = 63,149.10 × 12,516.61
4. Step 4: Simplify right side
   42,106.72x = 790,412,656.55
5. Step 5: Solve for x
   x = 790,412,656.55/42,106.72
6. Step 6: Final answer
   x = 18,771.65