Finding the Fourth Proportional to 2,840.86, 4,260.06 and 991.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,840.86 : 4,260.06 = 991.42 : x
2. Step 2: Convert to fraction form
   2,840.86/4,260.06 = 991.42/x
3. Step 3: Cross multiply
   2,840.86x = 4,260.06 × 991.42
4. Step 4: Simplify right side
   2,840.86x = 4,223,508.69
5. Step 5: Solve for x
   x = 4,223,508.69/2,840.86
6. Step 6: Final answer
   x = 1,486.70