Finding the Fourth Proportional to 8,543.78, 12,817.38 and 3,613.40

Step by Step Solution

1. Step 1: Write the proportion equation
   8,543.78 : 12,817.38 = 3,613.40 : x
2. Step 2: Convert to fraction form
   8,543.78/12,817.38 = 3,613.40/x
3. Step 3: Cross multiply
   8,543.78x = 12,817.38 × 3,613.40
4. Step 4: Simplify right side
   8,543.78x = 46,314,320.89
5. Step 5: Solve for x
   x = 46,314,320.89/8,543.78
6. Step 6: Final answer
   x = 5,420.82