Finding the Fourth Proportional to 1,353.91, 1,868.39 and 764.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,353.91 : 1,868.39 = 764.43 : x
2. Step 2: Convert to fraction form
   1,353.91/1,868.39 = 764.43/x
3. Step 3: Cross multiply
   1,353.91x = 1,868.39 × 764.43
4. Step 4: Simplify right side
   1,353.91x = 1,428,253.37
5. Step 5: Solve for x
   x = 1,428,253.37/1,353.91
6. Step 6: Final answer
   x = 1,054.91