Finding the Fourth Proportional to 1,377.95, 1,901.61 and 788.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.95 : 1,901.61 = 788.54 : x
2. Step 2: Convert to fraction form
   1,377.95/1,901.61 = 788.54/x
3. Step 3: Cross multiply
   1,377.95x = 1,901.61 × 788.54
4. Step 4: Simplify right side
   1,377.95x = 1,499,486.04
5. Step 5: Solve for x
   x = 1,499,486.04/1,377.95
6. Step 6: Final answer
   x = 1,088.20