Finding the Fourth Proportional to 1,401.47, 1,934.37 and 811.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.47 : 1,934.37 = 811.92 : x
2. Step 2: Convert to fraction form
   1,401.47/1,934.37 = 811.92/x
3. Step 3: Cross multiply
   1,401.47x = 1,934.37 × 811.92
4. Step 4: Simplify right side
   1,401.47x = 1,570,553.69
5. Step 5: Solve for x
   x = 1,570,553.69/1,401.47
6. Step 6: Final answer
   x = 1,120.65