Finding the Fourth Proportional to 1,389.59, 1,914.38 and 969.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.59 : 1,914.38 = 969.18 : x
2. Step 2: Convert to fraction form
   1,389.59/1,914.38 = 969.18/x
3. Step 3: Cross multiply
   1,389.59x = 1,914.38 × 969.18
4. Step 4: Simplify right side
   1,389.59x = 1,855,373.96
5. Step 5: Solve for x
   x = 1,855,373.96/1,389.59
6. Step 6: Final answer
   x = 1,335.20