Finding the Fourth Proportional to 2,189.50, 3,285.86 and 1,217.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,189.50 : 3,285.86 = 1,217.50 : x
2. Step 2: Convert to fraction form
   2,189.50/3,285.86 = 1,217.50/x
3. Step 3: Cross multiply
   2,189.50x = 3,285.86 × 1,217.50
4. Step 4: Simplify right side
   2,189.50x = 4,000,534.55
5. Step 5: Solve for x
   x = 4,000,534.55/2,189.50
6. Step 6: Final answer
   x = 1,827.15