Finding the Fourth Proportional to 1,378.23, 1,901.79 and 788.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,378.23 : 1,901.79 = 788.82 : x
2. Step 2: Convert to fraction form
   1,378.23/1,901.79 = 788.82/x
3. Step 3: Cross multiply
   1,378.23x = 1,901.79 × 788.82
4. Step 4: Simplify right side
   1,378.23x = 1,500,169.99
5. Step 5: Solve for x
   x = 1,500,169.99/1,378.23
6. Step 6: Final answer
   x = 1,088.48