Finding the Fourth Proportional to 1,970.67, 2,719.42 and 1,086.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,970.67 : 2,719.42 = 1,086.31 : x
2. Step 2: Convert to fraction form
   1,970.67/2,719.42 = 1,086.31/x
3. Step 3: Cross multiply
   1,970.67x = 2,719.42 × 1,086.31
4. Step 4: Simplify right side
   1,970.67x = 2,954,133.14
5. Step 5: Solve for x
   x = 2,954,133.14/1,970.67
6. Step 6: Final answer
   x = 1,499.05