Finding the Fourth Proportional to 1,393.61, 1,923.16 and 764.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.61 : 1,923.16 = 764.17 : x
2. Step 2: Convert to fraction form
   1,393.61/1,923.16 = 764.17/x
3. Step 3: Cross multiply
   1,393.61x = 1,923.16 × 764.17
4. Step 4: Simplify right side
   1,393.61x = 1,469,621.18
5. Step 5: Solve for x
   x = 1,469,621.18/1,393.61
6. Step 6: Final answer
   x = 1,054.55