Finding the Fourth Proportional to 12,100.23, 18,139.41 and 8,404.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,100.23 : 18,139.41 = 8,404.20 : x
2. Step 2: Convert to fraction form
   12,100.23/18,139.41 = 8,404.20/x
3. Step 3: Cross multiply
   12,100.23x = 18,139.41 × 8,404.20
4. Step 4: Simplify right side
   12,100.23x = 152,447,229.52
5. Step 5: Solve for x
   x = 152,447,229.52/12,100.23
6. Step 6: Final answer
   x = 12,598.71