Finding the Fourth Proportional to 1,948.56, 2,689.71 and 1,389.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,948.56 : 2,689.71 = 1,389.35 : x
2. Step 2: Convert to fraction form
   1,948.56/2,689.71 = 1,389.35/x
3. Step 3: Cross multiply
   1,948.56x = 2,689.71 × 1,389.35
4. Step 4: Simplify right side
   1,948.56x = 3,736,950.10
5. Step 5: Solve for x
   x = 3,736,950.10/1,948.56
6. Step 6: Final answer
   x = 1,917.80