Finding the Fourth Proportional to 1,377.69, 1,900.98 and 788.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.69 : 1,900.98 = 788.10 : x
2. Step 2: Convert to fraction form
   1,377.69/1,900.98 = 788.10/x
3. Step 3: Cross multiply
   1,377.69x = 1,900.98 × 788.10
4. Step 4: Simplify right side
   1,377.69x = 1,498,162.34
5. Step 5: Solve for x
   x = 1,498,162.34/1,377.69
6. Step 6: Final answer
   x = 1,087.45