Finding the Fourth Proportional to 2,919.84, 4,380.42 and 972.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,919.84 : 4,380.42 = 972.12 : x
2. Step 2: Convert to fraction form
   2,919.84/4,380.42 = 972.12/x
3. Step 3: Cross multiply
   2,919.84x = 4,380.42 × 972.12
4. Step 4: Simplify right side
   2,919.84x = 4,258,293.89
5. Step 5: Solve for x
   x = 4,258,293.89/2,919.84
6. Step 6: Final answer
   x = 1,458.40