Finding the Fourth Proportional to 1,401.04, 1,933.86 and 811.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.04 : 1,933.86 = 811.72 : x
2. Step 2: Convert to fraction form
   1,401.04/1,933.86 = 811.72/x
3. Step 3: Cross multiply
   1,401.04x = 1,933.86 × 811.72
4. Step 4: Simplify right side
   1,401.04x = 1,569,752.84
5. Step 5: Solve for x
   x = 1,569,752.84/1,401.04
6. Step 6: Final answer
   x = 1,120.42