Finding the Fourth Proportional to 1,190.72, 1,784.59 and 574.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,190.72 : 1,784.59 = 574.31 : x
2. Step 2: Convert to fraction form
   1,190.72/1,784.59 = 574.31/x
3. Step 3: Cross multiply
   1,190.72x = 1,784.59 × 574.31
4. Step 4: Simplify right side
   1,190.72x = 1,024,897.52
5. Step 5: Solve for x
   x = 1,024,897.52/1,190.72
6. Step 6: Final answer
   x = 860.74