Finding the Fourth Proportional to 1,382.38, 2,071.14 and 1,231.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,382.38 : 2,071.14 = 1,231.72 : x
2. Step 2: Convert to fraction form
   1,382.38/2,071.14 = 1,231.72/x
3. Step 3: Cross multiply
   1,382.38x = 2,071.14 × 1,231.72
4. Step 4: Simplify right side
   1,382.38x = 2,551,064.56
5. Step 5: Solve for x
   x = 2,551,064.56/1,382.38
6. Step 6: Final answer
   x = 1,845.41