Finding the Fourth Proportional to 1,271.42, 1,907.55 and 541.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,271.42 : 1,907.55 = 541.61 : x
2. Step 2: Convert to fraction form
   1,271.42/1,907.55 = 541.61/x
3. Step 3: Cross multiply
   1,271.42x = 1,907.55 × 541.61
4. Step 4: Simplify right side
   1,271.42x = 1,033,148.16
5. Step 5: Solve for x
   x = 1,033,148.16/1,271.42
6. Step 6: Final answer
   x = 812.59