Finding the Fourth Proportional to 1,355.05, 1,870.08 and 765.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.05 : 1,870.08 = 765.69 : x
2. Step 2: Convert to fraction form
   1,355.05/1,870.08 = 765.69/x
3. Step 3: Cross multiply
   1,355.05x = 1,870.08 × 765.69
4. Step 4: Simplify right side
   1,355.05x = 1,431,901.56
5. Step 5: Solve for x
   x = 1,431,901.56/1,355.05
6. Step 6: Final answer
   x = 1,056.71