Finding the Fourth Proportional to 1,355.42, 1,870.60 and 765.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.42 : 1,870.60 = 765.94 : x
2. Step 2: Convert to fraction form
   1,355.42/1,870.60 = 765.94/x
3. Step 3: Cross multiply
   1,355.42x = 1,870.60 × 765.94
4. Step 4: Simplify right side
   1,355.42x = 1,432,767.36
5. Step 5: Solve for x
   x = 1,432,767.36/1,355.42
6. Step 6: Final answer
   x = 1,057.07