Finding the Fourth Proportional to 1,620.55, 2,431.33 and 580.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,620.55 : 2,431.33 = 580.52 : x
2. Step 2: Convert to fraction form
   1,620.55/2,431.33 = 580.52/x
3. Step 3: Cross multiply
   1,620.55x = 2,431.33 × 580.52
4. Step 4: Simplify right side
   1,620.55x = 1,411,435.69
5. Step 5: Solve for x
   x = 1,411,435.69/1,620.55
6. Step 6: Final answer
   x = 870.96