Finding the Fourth Proportional to 3,613.55, 4,985.90 and 2,100.88

Step by Step Solution

1. Step 1: Write the proportion equation
   3,613.55 : 4,985.90 = 2,100.88 : x
2. Step 2: Convert to fraction form
   3,613.55/4,985.90 = 2,100.88/x
3. Step 3: Cross multiply
   3,613.55x = 4,985.90 × 2,100.88
4. Step 4: Simplify right side
   3,613.55x = 10,474,742.16
5. Step 5: Solve for x
   x = 10,474,742.16/3,613.55
6. Step 6: Final answer
   x = 2,898.74