Finding the Fourth Proportional to 3,401.61, 5,099.15 and 1,209.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,401.61 : 5,099.15 = 1,209.15 : x
2. Step 2: Convert to fraction form
   3,401.61/5,099.15 = 1,209.15/x
3. Step 3: Cross multiply
   3,401.61x = 5,099.15 × 1,209.15
4. Step 4: Simplify right side
   3,401.61x = 6,165,631.18
5. Step 5: Solve for x
   x = 6,165,631.18/3,401.61
6. Step 6: Final answer
   x = 1,812.56