Finding the Fourth Proportional to 1,222.02, 1,686.13 and 724.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222.02 : 1,686.13 = 724.72 : x
2. Step 2: Convert to fraction form
   1,222.02/1,686.13 = 724.72/x
3. Step 3: Cross multiply
   1,222.02x = 1,686.13 × 724.72
4. Step 4: Simplify right side
   1,222.02x = 1,221,972.13
5. Step 5: Solve for x
   x = 1,221,972.13/1,222.02
6. Step 6: Final answer
   x = 999.96