Finding the Fourth Proportional to 1,334.16, 1,839.42 and 891.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,334.16 : 1,839.42 = 891.72 : x
2. Step 2: Convert to fraction form
   1,334.16/1,839.42 = 891.72/x
3. Step 3: Cross multiply
   1,334.16x = 1,839.42 × 891.72
4. Step 4: Simplify right side
   1,334.16x = 1,640,247.60
5. Step 5: Solve for x
   x = 1,640,247.60/1,334.16
6. Step 6: Final answer
   x = 1,229.42