Finding the Fourth Proportional to 1,397.35, 1,928.22 and 767.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.35 : 1,928.22 = 767.87 : x
2. Step 2: Convert to fraction form
   1,397.35/1,928.22 = 767.87/x
3. Step 3: Cross multiply
   1,397.35x = 1,928.22 × 767.87
4. Step 4: Simplify right side
   1,397.35x = 1,480,620.37
5. Step 5: Solve for x
   x = 1,480,620.37/1,397.35
6. Step 6: Final answer
   x = 1,059.59