Finding the Fourth Proportional to 12,623.48, 17,417.33 and 8,603.55

Step by Step Solution

1. Step 1: Write the proportion equation
   12,623.48 : 17,417.33 = 8,603.55 : x
2. Step 2: Convert to fraction form
   12,623.48/17,417.33 = 8,603.55/x
3. Step 3: Cross multiply
   12,623.48x = 17,417.33 × 8,603.55
4. Step 4: Simplify right side
   12,623.48x = 149,850,826.50
5. Step 5: Solve for x
   x = 149,850,826.50/12,623.48
6. Step 6: Final answer
   x = 11,870.81