Finding the Fourth Proportional to 3,613.86, 5,421.89 and 1,715.64

Step by Step Solution

1. Step 1: Write the proportion equation
   3,613.86 : 5,421.89 = 1,715.64 : x
2. Step 2: Convert to fraction form
   3,613.86/5,421.89 = 1,715.64/x
3. Step 3: Cross multiply
   3,613.86x = 5,421.89 × 1,715.64
4. Step 4: Simplify right side
   3,613.86x = 9,302,002.78
5. Step 5: Solve for x
   x = 9,302,002.78/3,613.86
6. Step 6: Final answer
   x = 2,573.98