Finding the Fourth Proportional to 139,022.62, 208,372.59 and 63,985.21

Step by Step Solution

1. Step 1: Write the proportion equation
   139,022.62 : 208,372.59 = 63,985.21 : x
2. Step 2: Convert to fraction form
   139,022.62/208,372.59 = 63,985.21/x
3. Step 3: Cross multiply
   139,022.62x = 208,372.59 × 63,985.21
4. Step 4: Simplify right side
   139,022.62x = 13,332,763,929.39
5. Step 5: Solve for x
   x = 13,332,763,929.39/139,022.62
6. Step 6: Final answer
   x = 95,903.56