Finding the Fourth Proportional to 2,506.79, 3,459.28 and 1,387.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,506.79 : 3,459.28 = 1,387.71 : x
2. Step 2: Convert to fraction form
   2,506.79/3,459.28 = 1,387.71/x
3. Step 3: Cross multiply
   2,506.79x = 3,459.28 × 1,387.71
4. Step 4: Simplify right side
   2,506.79x = 4,800,473.98
5. Step 5: Solve for x
   x = 4,800,473.98/2,506.79
6. Step 6: Final answer
   x = 1,914.99