Finding the Fourth Proportional to 1,375.73, 1,898.64 and 786.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,375.73 : 1,898.64 = 786.31 : x
2. Step 2: Convert to fraction form
   1,375.73/1,898.64 = 786.31/x
3. Step 3: Cross multiply
   1,375.73x = 1,898.64 × 786.31
4. Step 4: Simplify right side
   1,375.73x = 1,492,914.87
5. Step 5: Solve for x
   x = 1,492,914.87/1,375.73
6. Step 6: Final answer
   x = 1,085.18