Finding the Fourth Proportional to 1,375.72, 1,897.28 and 1,229.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,375.72 : 1,897.28 = 1,229.92 : x
2. Step 2: Convert to fraction form
   1,375.72/1,897.28 = 1,229.92/x
3. Step 3: Cross multiply
   1,375.72x = 1,897.28 × 1,229.92
4. Step 4: Simplify right side
   1,375.72x = 2,333,502.62
5. Step 5: Solve for x
   x = 2,333,502.62/1,375.72
6. Step 6: Final answer
   x = 1,696.20