Finding the Fourth Proportional to 139,636.94, 207,876.18 and 138,806.69

Step by Step Solution

1. Step 1: Write the proportion equation
   139,636.94 : 207,876.18 = 138,806.69 : x
2. Step 2: Convert to fraction form
   139,636.94/207,876.18 = 138,806.69/x
3. Step 3: Cross multiply
   139,636.94x = 207,876.18 × 138,806.69
4. Step 4: Simplify right side
   139,636.94x = 28,854,603,781.61
5. Step 5: Solve for x
   x = 28,854,603,781.61/139,636.94
6. Step 6: Final answer
   x = 206,640.19