Finding the Fourth Proportional to 12,103.61, 18,144.47 and 8,407.58

Step by Step Solution

1. Step 1: Write the proportion equation
   12,103.61 : 18,144.47 = 8,407.58 : x
2. Step 2: Convert to fraction form
   12,103.61/18,144.47 = 8,407.58/x
3. Step 3: Cross multiply
   12,103.61x = 18,144.47 × 8,407.58
4. Step 4: Simplify right side
   12,103.61x = 152,550,950.32
5. Step 5: Solve for x
   x = 152,550,950.32/12,103.61
6. Step 6: Final answer
   x = 12,603.76