Finding the Fourth Proportional to 1,355.29, 1,870.18 and 765.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.29 : 1,870.18 = 765.86 : x
2. Step 2: Convert to fraction form
   1,355.29/1,870.18 = 765.86/x
3. Step 3: Cross multiply
   1,355.29x = 1,870.18 × 765.86
4. Step 4: Simplify right side
   1,355.29x = 1,432,284.79
5. Step 5: Solve for x
   x = 1,432,284.79/1,355.29
6. Step 6: Final answer
   x = 1,056.81