Finding the Fourth Proportional to 1,124.61, 1,685.83 and 712.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,124.61 : 1,685.83 = 712.72 : x
2. Step 2: Convert to fraction form
   1,124.61/1,685.83 = 712.72/x
3. Step 3: Cross multiply
   1,124.61x = 1,685.83 × 712.72
4. Step 4: Simplify right side
   1,124.61x = 1,201,524.76
5. Step 5: Solve for x
   x = 1,201,524.76/1,124.61
6. Step 6: Final answer
   x = 1,068.39