Finding the Fourth Proportional to 1,333.76, 1,839.72 and 1,072.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,333.76 : 1,839.72 = 1,072.40 : x
2. Step 2: Convert to fraction form
   1,333.76/1,839.72 = 1,072.40/x
3. Step 3: Cross multiply
   1,333.76x = 1,839.72 × 1,072.40
4. Step 4: Simplify right side
   1,333.76x = 1,972,915.73
5. Step 5: Solve for x
   x = 1,972,915.73/1,333.76
6. Step 6: Final answer
   x = 1,479.21