Finding the Fourth Proportional to 139,972.38, 209,915.51 and 40,105.82

Step by Step Solution

1. Step 1: Write the proportion equation
   139,972.38 : 209,915.51 = 40,105.82 : x
2. Step 2: Convert to fraction form
   139,972.38/209,915.51 = 40,105.82/x
3. Step 3: Cross multiply
   139,972.38x = 209,915.51 × 40,105.82
4. Step 4: Simplify right side
   139,972.38x = 8,418,832,409.16
5. Step 5: Solve for x
   x = 8,418,832,409.16/139,972.38
6. Step 6: Final answer
   x = 60,146.38