Finding the Fourth Proportional to 2,479.95, 3,721.72 and 920.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,479.95 : 3,721.72 = 920.17 : x
2. Step 2: Convert to fraction form
   2,479.95/3,721.72 = 920.17/x
3. Step 3: Cross multiply
   2,479.95x = 3,721.72 × 920.17
4. Step 4: Simplify right side
   2,479.95x = 3,424,619.77
5. Step 5: Solve for x
   x = 3,424,619.77/2,479.95
6. Step 6: Final answer
   x = 1,380.92