Finding the Fourth Proportional to 139,613.94, 207,841.85 and 138,783.57

Step by Step Solution

1. Step 1: Write the proportion equation
   139,613.94 : 207,841.85 = 138,783.57 : x
2. Step 2: Convert to fraction form
   139,613.94/207,841.85 = 138,783.57/x
3. Step 3: Cross multiply
   139,613.94x = 207,841.85 × 138,783.57
4. Step 4: Simplify right side
   139,613.94x = 28,845,033,938.40
5. Step 5: Solve for x
   x = 28,845,033,938.40/139,613.94
6. Step 6: Final answer
   x = 206,605.69