Finding the Fourth Proportional to 139,796.02, 209,679.42 and 39,949.78

Step by Step Solution

1. Step 1: Write the proportion equation
   139,796.02 : 209,679.42 = 39,949.78 : x
2. Step 2: Convert to fraction form
   139,796.02/209,679.42 = 39,949.78/x
3. Step 3: Cross multiply
   139,796.02x = 209,679.42 × 39,949.78
4. Step 4: Simplify right side
   139,796.02x = 8,376,646,699.53
5. Step 5: Solve for x
   x = 8,376,646,699.53/139,796.02
6. Step 6: Final answer
   x = 59,920.49