Finding the Fourth Proportional to 20,061.18, 30,074.88 and 12,649.32

Step by Step Solution

1. Step 1: Write the proportion equation
   20,061.18 : 30,074.88 = 12,649.32 : x
2. Step 2: Convert to fraction form
   20,061.18/30,074.88 = 12,649.32/x
3. Step 3: Cross multiply
   20,061.18x = 30,074.88 × 12,649.32
4. Step 4: Simplify right side
   20,061.18x = 380,426,781.08
5. Step 5: Solve for x
   x = 380,426,781.08/20,061.18
6. Step 6: Final answer
   x = 18,963.33