Finding the Fourth Proportional to 1,870.71, 2,806.47 and 572.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.71 : 2,806.47 = 572.15 : x
2. Step 2: Convert to fraction form
   1,870.71/2,806.47 = 572.15/x
3. Step 3: Cross multiply
   1,870.71x = 2,806.47 × 572.15
4. Step 4: Simplify right side
   1,870.71x = 1,605,707.78
5. Step 5: Solve for x
   x = 1,605,707.78/1,870.71
6. Step 6: Final answer
   x = 858.34