Finding the Fourth Proportional to 1,353.89, 1,868.53 and 764.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,353.89 : 1,868.53 = 764.55 : x
2. Step 2: Convert to fraction form
   1,353.89/1,868.53 = 764.55/x
3. Step 3: Cross multiply
   1,353.89x = 1,868.53 × 764.55
4. Step 4: Simplify right side
   1,353.89x = 1,428,584.61
5. Step 5: Solve for x
   x = 1,428,584.61/1,353.89
6. Step 6: Final answer
   x = 1,055.17