Finding the Fourth Proportional to 1,389.32, 1,915.33 and 969.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.32 : 1,915.33 = 969.06 : x
2. Step 2: Convert to fraction form
   1,389.32/1,915.33 = 969.06/x
3. Step 3: Cross multiply
   1,389.32x = 1,915.33 × 969.06
4. Step 4: Simplify right side
   1,389.32x = 1,856,069.69
5. Step 5: Solve for x
   x = 1,856,069.69/1,389.32
6. Step 6: Final answer
   x = 1,335.96