Finding the Fourth Proportional to 1,389.25, 1,917.29 and 768.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.25 : 1,917.29 = 768.37 : x
2. Step 2: Convert to fraction form
   1,389.25/1,917.29 = 768.37/x
3. Step 3: Cross multiply
   1,389.25x = 1,917.29 × 768.37
4. Step 4: Simplify right side
   1,389.25x = 1,473,188.12
5. Step 5: Solve for x
   x = 1,473,188.12/1,389.25
6. Step 6: Final answer
   x = 1,060.42