Finding the Fourth Proportional to 1,377.61, 1,901.06 and 788.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.61 : 1,901.06 = 788.11 : x
2. Step 2: Convert to fraction form
   1,377.61/1,901.06 = 788.11/x
3. Step 3: Cross multiply
   1,377.61x = 1,901.06 × 788.11
4. Step 4: Simplify right side
   1,377.61x = 1,498,234.89
5. Step 5: Solve for x
   x = 1,498,234.89/1,377.61
6. Step 6: Final answer
   x = 1,087.56