Finding the Fourth Proportional to 1,375.57, 1,898.29 and 786.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,375.57 : 1,898.29 = 786.45 : x
2. Step 2: Convert to fraction form
   1,375.57/1,898.29 = 786.45/x
3. Step 3: Cross multiply
   1,375.57x = 1,898.29 × 786.45
4. Step 4: Simplify right side
   1,375.57x = 1,492,910.17
5. Step 5: Solve for x
   x = 1,492,910.17/1,375.57
6. Step 6: Final answer
   x = 1,085.30