Finding the Fourth Proportional to 2,145.72, 3,219.18 and 606.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.72 : 3,219.18 = 606.76 : x
2. Step 2: Convert to fraction form
   2,145.72/3,219.18 = 606.76/x
3. Step 3: Cross multiply
   2,145.72x = 3,219.18 × 606.76
4. Step 4: Simplify right side
   2,145.72x = 1,953,269.66
5. Step 5: Solve for x
   x = 1,953,269.66/2,145.72
6. Step 6: Final answer
   x = 910.31