Finding the Fourth Proportional to 1,605.86, 2,217.46 and 1,236.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,605.86 : 2,217.46 = 1,236.50 : x
2. Step 2: Convert to fraction form
   1,605.86/2,217.46 = 1,236.50/x
3. Step 3: Cross multiply
   1,605.86x = 2,217.46 × 1,236.50
4. Step 4: Simplify right side
   1,605.86x = 2,741,889.29
5. Step 5: Solve for x
   x = 2,741,889.29/1,605.86
6. Step 6: Final answer
   x = 1,707.43