Finding the Fourth Proportional to 8,404.74, 12,618.09 and 5,643.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,404.74 : 12,618.09 = 5,643.72 : x
2. Step 2: Convert to fraction form
   8,404.74/12,618.09 = 5,643.72/x
3. Step 3: Cross multiply
   8,404.74x = 12,618.09 × 5,643.72
4. Step 4: Simplify right side
   8,404.74x = 71,212,966.89
5. Step 5: Solve for x
   x = 71,212,966.89/8,404.74
6. Step 6: Final answer
   x = 8,472.95