Finding the Fourth Proportional to 1,375.83, 1,899.07 and 786.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,375.83 : 1,899.07 = 786.76 : x
2. Step 2: Convert to fraction form
   1,375.83/1,899.07 = 786.76/x
3. Step 3: Cross multiply
   1,375.83x = 1,899.07 × 786.76
4. Step 4: Simplify right side
   1,375.83x = 1,494,105.60
5. Step 5: Solve for x
   x = 1,494,105.60/1,375.83
6. Step 6: Final answer
   x = 1,085.97