Finding the Fourth Proportional to 1,389.29, 1,914.85 and 1,271.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.29 : 1,914.85 = 1,271.59 : x
2. Step 2: Convert to fraction form
   1,389.29/1,914.85 = 1,271.59/x
3. Step 3: Cross multiply
   1,389.29x = 1,914.85 × 1,271.59
4. Step 4: Simplify right side
   1,389.29x = 2,434,904.11
5. Step 5: Solve for x
   x = 2,434,904.11/1,389.29
6. Step 6: Final answer
   x = 1,752.62