Finding the Fourth Proportional to 1,340.58, 2,011.72 and 724.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,340.58 : 2,011.72 = 724.71 : x
2. Step 2: Convert to fraction form
   1,340.58/2,011.72 = 724.71/x
3. Step 3: Cross multiply
   1,340.58x = 2,011.72 × 724.71
4. Step 4: Simplify right side
   1,340.58x = 1,457,913.60
5. Step 5: Solve for x
   x = 1,457,913.60/1,340.58
6. Step 6: Final answer
   x = 1,087.52