Finding the Fourth Proportional to 1,271.10, 1,906.98 and 540.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,271.10 : 1,906.98 = 540.69 : x
2. Step 2: Convert to fraction form
   1,271.10/1,906.98 = 540.69/x
3. Step 3: Cross multiply
   1,271.10x = 1,906.98 × 540.69
4. Step 4: Simplify right side
   1,271.10x = 1,031,085.02
5. Step 5: Solve for x
   x = 1,031,085.02/1,271.10
6. Step 6: Final answer
   x = 811.18