Finding the Fourth Proportional to 1,380.38, 2,068.14 and 1,229.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.38 : 2,068.14 = 1,229.72 : x
2. Step 2: Convert to fraction form
   1,380.38/2,068.14 = 1,229.72/x
3. Step 3: Cross multiply
   1,380.38x = 2,068.14 × 1,229.72
4. Step 4: Simplify right side
   1,380.38x = 2,543,233.12
5. Step 5: Solve for x
   x = 2,543,233.12/1,380.38
6. Step 6: Final answer
   x = 1,842.42