Finding the Fourth Proportional to 1,189.71, 1,783.69 and 572.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189.71 : 1,783.69 = 572.83 : x
2. Step 2: Convert to fraction form
   1,189.71/1,783.69 = 572.83/x
3. Step 3: Cross multiply
   1,189.71x = 1,783.69 × 572.83
4. Step 4: Simplify right side
   1,189.71x = 1,021,745.25
5. Step 5: Solve for x
   x = 1,021,745.25/1,189.71
6. Step 6: Final answer
   x = 858.82