Finding the Fourth Proportional to 1,355.29, 1,870.06 and 765.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.29 : 1,870.06 = 765.81 : x
2. Step 2: Convert to fraction form
   1,355.29/1,870.06 = 765.81/x
3. Step 3: Cross multiply
   1,355.29x = 1,870.06 × 765.81
4. Step 4: Simplify right side
   1,355.29x = 1,432,110.65
5. Step 5: Solve for x
   x = 1,432,110.65/1,355.29
6. Step 6: Final answer
   x = 1,056.68