Finding the Fourth Proportional to 2,145.50, 3,218.79 and 606.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.50 : 3,218.79 = 606.50 : x
2. Step 2: Convert to fraction form
   2,145.50/3,218.79 = 606.50/x
3. Step 3: Cross multiply
   2,145.50x = 3,218.79 × 606.50
4. Step 4: Simplify right side
   2,145.50x = 1,952,196.14
5. Step 5: Solve for x
   x = 1,952,196.14/2,145.50
6. Step 6: Final answer
   x = 909.90