Finding the Fourth Proportional to 1,378.28, 1,901.97 and 788.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,378.28 : 1,901.97 = 788.81 : x
2. Step 2: Convert to fraction form
   1,378.28/1,901.97 = 788.81/x
3. Step 3: Cross multiply
   1,378.28x = 1,901.97 × 788.81
4. Step 4: Simplify right side
   1,378.28x = 1,500,283.45
5. Step 5: Solve for x
   x = 1,500,283.45/1,378.28
6. Step 6: Final answer
   x = 1,088.52