Finding the Fourth Proportional to 8,613.53, 12,925.76 and 3,687.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,613.53 : 12,925.76 = 3,687.31 : x
2. Step 2: Convert to fraction form
   8,613.53/12,925.76 = 3,687.31/x
3. Step 3: Cross multiply
   8,613.53x = 12,925.76 × 3,687.31
4. Step 4: Simplify right side
   8,613.53x = 47,661,233.35
5. Step 5: Solve for x
   x = 47,661,233.35/8,613.53
6. Step 6: Final answer
   x = 5,533.30