Finding the Fourth Proportional to 1,401.99, 1,935.17 and 812.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.99 : 1,935.17 = 812.79 : x
2. Step 2: Convert to fraction form
   1,401.99/1,935.17 = 812.79/x
3. Step 3: Cross multiply
   1,401.99x = 1,935.17 × 812.79
4. Step 4: Simplify right side
   1,401.99x = 1,572,882.76
5. Step 5: Solve for x
   x = 1,572,882.76/1,401.99
6. Step 6: Final answer
   x = 1,121.89