Finding the Fourth Proportional to 712,196.72, 982,831.70 and 389,927.28

Step by Step Solution

1. Step 1: Write the proportion equation
   712,196.72 : 982,831.70 = 389,927.28 : x
2. Step 2: Convert to fraction form
   712,196.72/982,831.70 = 389,927.28/x
3. Step 3: Cross multiply
   712,196.72x = 982,831.70 × 389,927.28
4. Step 4: Simplify right side
   712,196.72x = 383,232,891,478.78
5. Step 5: Solve for x
   x = 383,232,891,478.78/712,196.72
6. Step 6: Final answer
   x = 538,099.77