Finding the Fourth Proportional to 2,840.52, 4,259.72 and 991.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,840.52 : 4,259.72 = 991.12 : x
2. Step 2: Convert to fraction form
   2,840.52/4,259.72 = 991.12/x
3. Step 3: Cross multiply
   2,840.52x = 4,259.72 × 991.12
4. Step 4: Simplify right side
   2,840.52x = 4,221,893.69
5. Step 5: Solve for x
   x = 4,221,893.69/2,840.52
6. Step 6: Final answer
   x = 1,486.31