Finding the Fourth Proportional to 1,393.71, 1,923.28 and 764.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.71 : 1,923.28 = 764.29 : x
2. Step 2: Convert to fraction form
   1,393.71/1,923.28 = 764.29/x
3. Step 3: Cross multiply
   1,393.71x = 1,923.28 × 764.29
4. Step 4: Simplify right side
   1,393.71x = 1,469,943.67
5. Step 5: Solve for x
   x = 1,469,943.67/1,393.71
6. Step 6: Final answer
   x = 1,054.70