Finding the Fourth Proportional to 1,386.64, 2,081.56 and 950.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.64 : 2,081.56 = 950.72 : x
2. Step 2: Convert to fraction form
   1,386.64/2,081.56 = 950.72/x
3. Step 3: Cross multiply
   1,386.64x = 2,081.56 × 950.72
4. Step 4: Simplify right side
   1,386.64x = 1,978,980.72
5. Step 5: Solve for x
   x = 1,978,980.72/1,386.64
6. Step 6: Final answer
   x = 1,427.18