Finding the Fourth Proportional to 1,341.05, 1,851.21 and 921.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,341.05 : 1,851.21 = 921.24 : x
2. Step 2: Convert to fraction form
   1,341.05/1,851.21 = 921.24/x
3. Step 3: Cross multiply
   1,341.05x = 1,851.21 × 921.24
4. Step 4: Simplify right side
   1,341.05x = 1,705,408.70
5. Step 5: Solve for x
   x = 1,705,408.70/1,341.05
6. Step 6: Final answer
   x = 1,271.70