Finding the Fourth Proportional to 2,659.91, 3,989.94 and 712.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.91 : 3,989.94 = 712.12 : x
2. Step 2: Convert to fraction form
   2,659.91/3,989.94 = 712.12/x
3. Step 3: Cross multiply
   2,659.91x = 3,989.94 × 712.12
4. Step 4: Simplify right side
   2,659.91x = 2,841,316.07
5. Step 5: Solve for x
   x = 2,841,316.07/2,659.91
6. Step 6: Final answer
   x = 1,068.20