Finding the Fourth Proportional to 2,111.81, 3,167.72 and 572.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.81 : 3,167.72 = 572.81 : x
2. Step 2: Convert to fraction form
   2,111.81/3,167.72 = 572.81/x
3. Step 3: Cross multiply
   2,111.81x = 3,167.72 × 572.81
4. Step 4: Simplify right side
   2,111.81x = 1,814,498.83
5. Step 5: Solve for x
   x = 1,814,498.83/2,111.81
6. Step 6: Final answer
   x = 859.22