Finding the Fourth Proportional to 2,638.40, 3,959.04 and 1,814.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.40 : 3,959.04 = 1,814.72 : x
2. Step 2: Convert to fraction form
   2,638.40/3,959.04 = 1,814.72/x
3. Step 3: Cross multiply
   2,638.40x = 3,959.04 × 1,814.72
4. Step 4: Simplify right side
   2,638.40x = 7,184,549.07
5. Step 5: Solve for x
   x = 7,184,549.07/2,638.40
6. Step 6: Final answer
   x = 2,723.07