Finding the Fourth Proportional to 1,381.57, 1,906.57 and 760.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,381.57 : 1,906.57 = 760.57 : x
2. Step 2: Convert to fraction form
   1,381.57/1,906.57 = 760.57/x
3. Step 3: Cross multiply
   1,381.57x = 1,906.57 × 760.57
4. Step 4: Simplify right side
   1,381.57x = 1,450,079.94
5. Step 5: Solve for x
   x = 1,450,079.94/1,381.57
6. Step 6: Final answer
   x = 1,049.59