Finding the Fourth Proportional to 2,172.71, 3,258.83 and 612.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,172.71 : 3,258.83 = 612.67 : x
2. Step 2: Convert to fraction form
   2,172.71/3,258.83 = 612.67/x
3. Step 3: Cross multiply
   2,172.71x = 3,258.83 × 612.67
4. Step 4: Simplify right side
   2,172.71x = 1,996,587.38
5. Step 5: Solve for x
   x = 1,996,587.38/2,172.71
6. Step 6: Final answer
   x = 918.94