Finding the Fourth Proportional to 1,377.55, 1,901.02 and 788.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.55 : 1,901.02 = 788.09 : x
2. Step 2: Convert to fraction form
   1,377.55/1,901.02 = 788.09/x
3. Step 3: Cross multiply
   1,377.55x = 1,901.02 × 788.09
4. Step 4: Simplify right side
   1,377.55x = 1,498,175.95
5. Step 5: Solve for x
   x = 1,498,175.95/1,377.55
6. Step 6: Final answer
   x = 1,087.56