Finding the Fourth Proportional to 1,401.32, 1,934.28 and 812

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.32 : 1,934.28 = 812 : x
2. Step 2: Convert to fraction form
   1,401.32/1,934.28 = 812/x
3. Step 3: Cross multiply
   1,401.32x = 1,934.28 × 812
4. Step 4: Simplify right side
   1,401.32x = 1,570,635.36
5. Step 5: Solve for x
   x = 1,570,635.36/1,401.32
6. Step 6: Final answer
   x = 1,120.83