Finding the Fourth Proportional to 613,258.72, 919,892.16 and 213,898

Step by Step Solution

1. Step 1: Write the proportion equation
   613,258.72 : 919,892.16 = 213,898 : x
2. Step 2: Convert to fraction form
   613,258.72/919,892.16 = 213,898/x
3. Step 3: Cross multiply
   613,258.72x = 919,892.16 × 213,898
4. Step 4: Simplify right side
   613,258.72x = 196,763,093,239.68
5. Step 5: Solve for x
   x = 196,763,093,239.68/613,258.72
6. Step 6: Final answer
   x = 320,848.42