Finding the Fourth Proportional to 1,401.63, 1,933.83 and 812.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.63 : 1,933.83 = 812.15 : x
2. Step 2: Convert to fraction form
   1,401.63/1,933.83 = 812.15/x
3. Step 3: Cross multiply
   1,401.63x = 1,933.83 × 812.15
4. Step 4: Simplify right side
   1,401.63x = 1,570,550.37
5. Step 5: Solve for x
   x = 1,570,550.37/1,401.63
6. Step 6: Final answer
   x = 1,120.52