Finding the Fourth Proportional to 1,393.87, 1,923.45 and 764.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.87 : 1,923.45 = 764.27 : x
2. Step 2: Convert to fraction form
   1,393.87/1,923.45 = 764.27/x
3. Step 3: Cross multiply
   1,393.87x = 1,923.45 × 764.27
4. Step 4: Simplify right side
   1,393.87x = 1,470,031.31
5. Step 5: Solve for x
   x = 1,470,031.31/1,393.87
6. Step 6: Final answer
   x = 1,054.64