Finding the Fourth Proportional to 1,388.38, 1,915.96 and 767.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.38 : 1,915.96 = 767.38 : x
2. Step 2: Convert to fraction form
   1,388.38/1,915.96 = 767.38/x
3. Step 3: Cross multiply
   1,388.38x = 1,915.96 × 767.38
4. Step 4: Simplify right side
   1,388.38x = 1,470,259.81
5. Step 5: Solve for x
   x = 1,470,259.81/1,388.38
6. Step 6: Final answer
   x = 1,058.98