Finding the Fourth Proportional to 42,108.72, 63,152.10 and 12,518.62

Step by Step Solution

1. Step 1: Write the proportion equation
   42,108.72 : 63,152.10 = 12,518.62 : x
2. Step 2: Convert to fraction form
   42,108.72/63,152.10 = 12,518.62/x
3. Step 3: Cross multiply
   42,108.72x = 63,152.10 × 12,518.62
4. Step 4: Simplify right side
   42,108.72x = 790,577,142.10
5. Step 5: Solve for x
   x = 790,577,142.10/42,108.72
6. Step 6: Final answer
   x = 18,774.67