Finding the Fourth Proportional to 1,870.74, 2,806.56 and 572.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.74 : 2,806.56 = 572.22 : x
2. Step 2: Convert to fraction form
   1,870.74/2,806.56 = 572.22/x
3. Step 3: Cross multiply
   1,870.74x = 2,806.56 × 572.22
4. Step 4: Simplify right side
   1,870.74x = 1,605,969.76
5. Step 5: Solve for x
   x = 1,605,969.76/1,870.74
6. Step 6: Final answer
   x = 858.47