Finding the Fourth Proportional to 1,376.35, 1,899.30 and 786.85

Step by Step Solution

1. Step 1: Write the proportion equation
   1,376.35 : 1,899.30 = 786.85 : x
2. Step 2: Convert to fraction form
   1,376.35/1,899.30 = 786.85/x
3. Step 3: Cross multiply
   1,376.35x = 1,899.30 × 786.85
4. Step 4: Simplify right side
   1,376.35x = 1,494,464.21
5. Step 5: Solve for x
   x = 1,494,464.21/1,376.35
6. Step 6: Final answer
   x = 1,085.82