Finding the Fourth Proportional to 2,840.86, 4,263.27 and 991.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,840.86 : 4,263.27 = 991.98 : x
2. Step 2: Convert to fraction form
   2,840.86/4,263.27 = 991.98/x
3. Step 3: Cross multiply
   2,840.86x = 4,263.27 × 991.98
4. Step 4: Simplify right side
   2,840.86x = 4,229,078.57
5. Step 5: Solve for x
   x = 4,229,078.57/2,840.86
6. Step 6: Final answer
   x = 1,488.66