Finding the Fourth Proportional to 1,389.48, 1,917.54 and 768.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.48 : 1,917.54 = 768.52 : x
2. Step 2: Convert to fraction form
   1,389.48/1,917.54 = 768.52/x
3. Step 3: Cross multiply
   1,389.48x = 1,917.54 × 768.52
4. Step 4: Simplify right side
   1,389.48x = 1,473,667.84
5. Step 5: Solve for x
   x = 1,473,667.84/1,389.48
6. Step 6: Final answer
   x = 1,060.59