Finding the Fourth Proportional to 1,212.52, 1,816.86 and 724.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,212.52 : 1,816.86 = 724.96 : x
2. Step 2: Convert to fraction form
   1,212.52/1,816.86 = 724.96/x
3. Step 3: Cross multiply
   1,212.52x = 1,816.86 × 724.96
4. Step 4: Simplify right side
   1,212.52x = 1,317,150.83
5. Step 5: Solve for x
   x = 1,317,150.83/1,212.52
6. Step 6: Final answer
   x = 1,086.29