Finding the Fourth Proportional to 1,401.17, 2,100.94 and 580.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.17 : 2,100.94 = 580.03 : x
2. Step 2: Convert to fraction form
   1,401.17/2,100.94 = 580.03/x
3. Step 3: Cross multiply
   1,401.17x = 2,100.94 × 580.03
4. Step 4: Simplify right side
   1,401.17x = 1,218,601.53
5. Step 5: Solve for x
   x = 1,218,601.53/1,401.17
6. Step 6: Final answer
   x = 869.71