Finding the Fourth Proportional to 1,375.80, 1,898.59 and 786.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,375.80 : 1,898.59 = 786.33 : x
2. Step 2: Convert to fraction form
   1,375.80/1,898.59 = 786.33/x
3. Step 3: Cross multiply
   1,375.80x = 1,898.59 × 786.33
4. Step 4: Simplify right side
   1,375.80x = 1,492,904.85
5. Step 5: Solve for x
   x = 1,492,904.85/1,375.80
6. Step 6: Final answer
   x = 1,085.12