Finding the Fourth Proportional to 476,578.72, 714,966.55 and 139,630.37

Step by Step Solution

1. Step 1: Write the proportion equation
   476,578.72 : 714,966.55 = 139,630.37 : x
2. Step 2: Convert to fraction form
   476,578.72/714,966.55 = 139,630.37/x
3. Step 3: Cross multiply
   476,578.72x = 714,966.55 × 139,630.37
4. Step 4: Simplify right side
   476,578.72x = 99,831,039,990.21
5. Step 5: Solve for x
   x = 99,831,039,990.21/476,578.72
6. Step 6: Final answer
   x = 209,474.40