Finding the Fourth Proportional to 2,920.77, 4,379.54 and 971.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,920.77 : 4,379.54 = 971.91 : x
2. Step 2: Convert to fraction form
   2,920.77/4,379.54 = 971.91/x
3. Step 3: Cross multiply
   2,920.77x = 4,379.54 × 971.91
4. Step 4: Simplify right side
   2,920.77x = 4,256,513.86
5. Step 5: Solve for x
   x = 4,256,513.86/2,920.77
6. Step 6: Final answer
   x = 1,457.33