Finding the Fourth Proportional to 1,401.58, 1,933.76 and 811.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.58 : 1,933.76 = 811.90 : x
2. Step 2: Convert to fraction form
   1,401.58/1,933.76 = 811.90/x
3. Step 3: Cross multiply
   1,401.58x = 1,933.76 × 811.90
4. Step 4: Simplify right side
   1,401.58x = 1,570,019.74
5. Step 5: Solve for x
   x = 1,570,019.74/1,401.58
6. Step 6: Final answer
   x = 1,120.18