Finding the Fourth Proportional to 1,353.78, 1,868.45 and 764.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,353.78 : 1,868.45 = 764.30 : x
2. Step 2: Convert to fraction form
   1,353.78/1,868.45 = 764.30/x
3. Step 3: Cross multiply
   1,353.78x = 1,868.45 × 764.30
4. Step 4: Simplify right side
   1,353.78x = 1,428,043.17
5. Step 5: Solve for x
   x = 1,428,043.17/1,353.78
6. Step 6: Final answer
   x = 1,054.86