Finding the Fourth Proportional to 2,508.71, 3,461.76 and 1,389.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,508.71 : 3,461.76 = 1,389.50 : x
2. Step 2: Convert to fraction form
   2,508.71/3,461.76 = 1,389.50/x
3. Step 3: Cross multiply
   2,508.71x = 3,461.76 × 1,389.50
4. Step 4: Simplify right side
   2,508.71x = 4,810,098.21
5. Step 5: Solve for x
   x = 4,810,098.21/2,508.71
6. Step 6: Final answer
   x = 1,917.36