Finding the Fourth Proportional to 1,970.87, 2,719.80 and 1,086.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,970.87 : 2,719.80 = 1,086.72 : x
2. Step 2: Convert to fraction form
   1,970.87/2,719.80 = 1,086.72/x
3. Step 3: Cross multiply
   1,970.87x = 2,719.80 × 1,086.72
4. Step 4: Simplify right side
   1,970.87x = 2,955,661.06
5. Step 5: Solve for x
   x = 2,955,661.06/1,970.87
6. Step 6: Final answer
   x = 1,499.68