Finding the Fourth Proportional to 1,401.97, 1,934.58 and 812.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.97 : 1,934.58 = 812.70 : x
2. Step 2: Convert to fraction form
   1,401.97/1,934.58 = 812.70/x
3. Step 3: Cross multiply
   1,401.97x = 1,934.58 × 812.70
4. Step 4: Simplify right side
   1,401.97x = 1,572,233.17
5. Step 5: Solve for x
   x = 1,572,233.17/1,401.97
6. Step 6: Final answer
   x = 1,121.45