Finding the Fourth Proportional to 2,506.81, 3,459.37 and 1,387.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,506.81 : 3,459.37 = 1,387.78 : x
2. Step 2: Convert to fraction form
   2,506.81/3,459.37 = 1,387.78/x
3. Step 3: Cross multiply
   2,506.81x = 3,459.37 × 1,387.78
4. Step 4: Simplify right side
   2,506.81x = 4,800,837.58
5. Step 5: Solve for x
   x = 4,800,837.58/2,506.81
6. Step 6: Final answer
   x = 1,915.12