Finding the Fourth Proportional to 139,361.40, 209,971.83 and 126,049.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,361.40 : 209,971.83 = 126,049.72 : x
2. Step 2: Convert to fraction form
   139,361.40/209,971.83 = 126,049.72/x
3. Step 3: Cross multiply
   139,361.40x = 209,971.83 × 126,049.72
4. Step 4: Simplify right side
   139,361.40x = 26,466,890,379.39
5. Step 5: Solve for x
   x = 26,466,890,379.39/139,361.40
6. Step 6: Final answer
   x = 189,915.50