Finding the Fourth Proportional to 1,353.79, 1,868.18 and 764.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,353.79 : 1,868.18 = 764.31 : x
2. Step 2: Convert to fraction form
   1,353.79/1,868.18 = 764.31/x
3. Step 3: Cross multiply
   1,353.79x = 1,868.18 × 764.31
4. Step 4: Simplify right side
   1,353.79x = 1,427,864.83
5. Step 5: Solve for x
   x = 1,427,864.83/1,353.79
6. Step 6: Final answer
   x = 1,054.72