Finding the Fourth Proportional to 13,781.62, 19,020.05 and 8,118.15

Step by Step Solution

1. Step 1: Write the proportion equation
   13,781.62 : 19,020.05 = 8,118.15 : x
2. Step 2: Convert to fraction form
   13,781.62/19,020.05 = 8,118.15/x
3. Step 3: Cross multiply
   13,781.62x = 19,020.05 × 8,118.15
4. Step 4: Simplify right side
   13,781.62x = 154,407,671.53
5. Step 5: Solve for x
   x = 154,407,671.53/13,781.62
6. Step 6: Final answer
   x = 11,203.88