Finding the Fourth Proportional to 2,075.61, 3,113.57 and 842.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,075.61 : 3,113.57 = 842.69 : x
2. Step 2: Convert to fraction form
   2,075.61/3,113.57 = 842.69/x
3. Step 3: Cross multiply
   2,075.61x = 3,113.57 × 842.69
4. Step 4: Simplify right side
   2,075.61x = 2,623,774.30
5. Step 5: Solve for x
   x = 2,623,774.30/2,075.61
6. Step 6: Final answer
   x = 1,264.10