Finding the Fourth Proportional to 1,401.87, 1,934.65 and 812.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.87 : 1,934.65 = 812.30 : x
2. Step 2: Convert to fraction form
   1,401.87/1,934.65 = 812.30/x
3. Step 3: Cross multiply
   1,401.87x = 1,934.65 × 812.30
4. Step 4: Simplify right side
   1,401.87x = 1,571,507.54
5. Step 5: Solve for x
   x = 1,571,507.54/1,401.87
6. Step 6: Final answer
   x = 1,121.01