Finding the Fourth Proportional to 2,613.76, 3,922.56 and 1,381.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,613.76 : 3,922.56 = 1,381.12 : x
2. Step 2: Convert to fraction form
   2,613.76/3,922.56 = 1,381.12/x
3. Step 3: Cross multiply
   2,613.76x = 3,922.56 × 1,381.12
4. Step 4: Simplify right side
   2,613.76x = 5,417,526.07
5. Step 5: Solve for x
   x = 5,417,526.07/2,613.76
6. Step 6: Final answer
   x = 2,072.69