Finding the Fourth Proportional to 1,970.72, 2,719.55 and 1,086.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,970.72 : 2,719.55 = 1,086.50 : x
2. Step 2: Convert to fraction form
   1,970.72/2,719.55 = 1,086.50/x
3. Step 3: Cross multiply
   1,970.72x = 2,719.55 × 1,086.50
4. Step 4: Simplify right side
   1,970.72x = 2,954,792.44
5. Step 5: Solve for x
   x = 2,954,792.44/1,970.72
6. Step 6: Final answer
   x = 1,499.34