Finding the Fourth Proportional to 2,075.52, 3,111.60 and 842.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,075.52 : 3,111.60 = 842.64 : x
2. Step 2: Convert to fraction form
   2,075.52/3,111.60 = 842.64/x
3. Step 3: Cross multiply
   2,075.52x = 3,111.60 × 842.64
4. Step 4: Simplify right side
   2,075.52x = 2,621,958.62
5. Step 5: Solve for x
   x = 2,621,958.62/2,075.52
6. Step 6: Final answer
   x = 1,263.28