Finding the Fourth Proportional to 1,401.88, 1,934.34 and 812.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.88 : 1,934.34 = 812.20 : x
2. Step 2: Convert to fraction form
   1,401.88/1,934.34 = 812.20/x
3. Step 3: Cross multiply
   1,401.88x = 1,934.34 × 812.20
4. Step 4: Simplify right side
   1,401.88x = 1,571,070.95
5. Step 5: Solve for x
   x = 1,571,070.95/1,401.88
6. Step 6: Final answer
   x = 1,120.69