Finding the Fourth Proportional to 2,920.86, 4,379.82 and 972.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,920.86 : 4,379.82 = 972.36 : x
2. Step 2: Convert to fraction form
   2,920.86/4,379.82 = 972.36/x
3. Step 3: Cross multiply
   2,920.86x = 4,379.82 × 972.36
4. Step 4: Simplify right side
   2,920.86x = 4,258,761.78
5. Step 5: Solve for x
   x = 4,258,761.78/2,920.86
6. Step 6: Final answer
   x = 1,458.05