Finding the Fourth Proportional to 1,056.88, 1,457.52 and 724.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,056.88 : 1,457.52 = 724.72 : x
2. Step 2: Convert to fraction form
   1,056.88/1,457.52 = 724.72/x
3. Step 3: Cross multiply
   1,056.88x = 1,457.52 × 724.72
4. Step 4: Simplify right side
   1,056.88x = 1,056,293.89
5. Step 5: Solve for x
   x = 1,056,293.89/1,056.88
6. Step 6: Final answer
   x = 999.45