Finding the Fourth Proportional to 1,401.42, 2,102.72 and 580.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.42 : 2,102.72 = 580.29 : x
2. Step 2: Convert to fraction form
   1,401.42/2,102.72 = 580.29/x
3. Step 3: Cross multiply
   1,401.42x = 2,102.72 × 580.29
4. Step 4: Simplify right side
   1,401.42x = 1,220,187.39
5. Step 5: Solve for x
   x = 1,220,187.39/1,401.42
6. Step 6: Final answer
   x = 870.68