Finding the Fourth Proportional to 2,920.90, 4,380.54 and 972.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,920.90 : 4,380.54 = 972.84 : x
2. Step 2: Convert to fraction form
   2,920.90/4,380.54 = 972.84/x
3. Step 3: Cross multiply
   2,920.90x = 4,380.54 × 972.84
4. Step 4: Simplify right side
   2,920.90x = 4,261,564.53
5. Step 5: Solve for x
   x = 4,261,564.53/2,920.90
6. Step 6: Final answer
   x = 1,458.99