Finding the Fourth Proportional to 1,378.74, 1,902.28 and 958.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,378.74 : 1,902.28 = 958.62 : x
2. Step 2: Convert to fraction form
   1,378.74/1,902.28 = 958.62/x
3. Step 3: Cross multiply
   1,378.74x = 1,902.28 × 958.62
4. Step 4: Simplify right side
   1,378.74x = 1,823,563.65
5. Step 5: Solve for x
   x = 1,823,563.65/1,378.74
6. Step 6: Final answer
   x = 1,322.63