Finding the Fourth Proportional to 2,613.18, 3,911.40 and 1,872.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,613.18 : 3,911.40 = 1,872.30 : x
2. Step 2: Convert to fraction form
   2,613.18/3,911.40 = 1,872.30/x
3. Step 3: Cross multiply
   2,613.18x = 3,911.40 × 1,872.30
4. Step 4: Simplify right side
   2,613.18x = 7,323,314.22
5. Step 5: Solve for x
   x = 7,323,314.22/2,613.18
6. Step 6: Final answer
   x = 2,802.45