Finding the Fourth Proportional to 1,355.30, 1,870.07 and 757.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.30 : 1,870.07 = 757.81 : x
2. Step 2: Convert to fraction form
   1,355.30/1,870.07 = 757.81/x
3. Step 3: Cross multiply
   1,355.30x = 1,870.07 × 757.81
4. Step 4: Simplify right side
   1,355.30x = 1,417,154.97
5. Step 5: Solve for x
   x = 1,417,154.97/1,355.30
6. Step 6: Final answer
   x = 1,045.64