Finding the Fourth Proportional to 2,111.50, 3,167.31 and 572.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.50 : 3,167.31 = 572.50 : x
2. Step 2: Convert to fraction form
   2,111.50/3,167.31 = 572.50/x
3. Step 3: Cross multiply
   2,111.50x = 3,167.31 × 572.50
4. Step 4: Simplify right side
   2,111.50x = 1,813,284.98
5. Step 5: Solve for x
   x = 1,813,284.98/2,111.50
6. Step 6: Final answer
   x = 858.77