Finding the Fourth Proportional to 1,075.83, 1,613.10 and 426.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,075.83 : 1,613.10 = 426.42 : x
2. Step 2: Convert to fraction form
   1,075.83/1,613.10 = 426.42/x
3. Step 3: Cross multiply
   1,075.83x = 1,613.10 × 426.42
4. Step 4: Simplify right side
   1,075.83x = 687,858.10
5. Step 5: Solve for x
   x = 687,858.10/1,075.83
6. Step 6: Final answer
   x = 639.37