Finding the Fourth Proportional to 2,111.77, 3,166.74 and 724.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.77 : 3,166.74 = 724.81 : x
2. Step 2: Convert to fraction form
   2,111.77/3,166.74 = 724.81/x
3. Step 3: Cross multiply
   2,111.77x = 3,166.74 × 724.81
4. Step 4: Simplify right side
   2,111.77x = 2,295,284.82
5. Step 5: Solve for x
   x = 2,295,284.82/2,111.77
6. Step 6: Final answer
   x = 1,086.90