Finding the Fourth Proportional to 1,267.84, 1,902.72 and 926.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,267.84 : 1,902.72 = 926.72 : x
2. Step 2: Convert to fraction form
   1,267.84/1,902.72 = 926.72/x
3. Step 3: Cross multiply
   1,267.84x = 1,902.72 × 926.72
4. Step 4: Simplify right side
   1,267.84x = 1,763,288.68
5. Step 5: Solve for x
   x = 1,763,288.68/1,267.84
6. Step 6: Final answer
   x = 1,390.78