Finding the Fourth Proportional to 1,400.10, 1,931.85 and 810.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,400.10 : 1,931.85 = 810.42 : x
2. Step 2: Convert to fraction form
   1,400.10/1,931.85 = 810.42/x
3. Step 3: Cross multiply
   1,400.10x = 1,931.85 × 810.42
4. Step 4: Simplify right side
   1,400.10x = 1,565,609.88
5. Step 5: Solve for x
   x = 1,565,609.88/1,400.10
6. Step 6: Final answer
   x = 1,118.21