Finding the Fourth Proportional to 1,353.84, 1,868.31 and 764.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,353.84 : 1,868.31 = 764.40 : x
2. Step 2: Convert to fraction form
   1,353.84/1,868.31 = 764.40/x
3. Step 3: Cross multiply
   1,353.84x = 1,868.31 × 764.40
4. Step 4: Simplify right side
   1,353.84x = 1,428,136.16
5. Step 5: Solve for x
   x = 1,428,136.16/1,353.84
6. Step 6: Final answer
   x = 1,054.88