Finding the Fourth Proportional to 1,378.27, 1,902.23 and 788.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,378.27 : 1,902.23 = 788.69 : x
2. Step 2: Convert to fraction form
   1,378.27/1,902.23 = 788.69/x
3. Step 3: Cross multiply
   1,378.27x = 1,902.23 × 788.69
4. Step 4: Simplify right side
   1,378.27x = 1,500,267.28
5. Step 5: Solve for x
   x = 1,500,267.28/1,378.27
6. Step 6: Final answer
   x = 1,088.52