Finding the Fourth Proportional to 1,375.89, 1,898.70 and 786.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,375.89 : 1,898.70 = 786.41 : x
2. Step 2: Convert to fraction form
   1,375.89/1,898.70 = 786.41/x
3. Step 3: Cross multiply
   1,375.89x = 1,898.70 × 786.41
4. Step 4: Simplify right side
   1,375.89x = 1,493,147.17
5. Step 5: Solve for x
   x = 1,493,147.17/1,375.89
6. Step 6: Final answer
   x = 1,085.23