Finding the Fourth Proportional to 12,142.77, 18,196.43 and 5,380.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,142.77 : 18,196.43 = 5,380.20 : x
2. Step 2: Convert to fraction form
   12,142.77/18,196.43 = 5,380.20/x
3. Step 3: Cross multiply
   12,142.77x = 18,196.43 × 5,380.20
4. Step 4: Simplify right side
   12,142.77x = 97,900,341.70
5. Step 5: Solve for x
   x = 97,900,341.70/12,142.77
6. Step 6: Final answer
   x = 8,062.44