Finding the Fourth Proportional to 139,640.94, 207,882.14 and 138,810.69

Step by Step Solution

1. Step 1: Write the proportion equation
   139,640.94 : 207,882.14 = 138,810.69 : x
2. Step 2: Convert to fraction form
   139,640.94/207,882.14 = 138,810.69/x
3. Step 3: Cross multiply
   139,640.94x = 207,882.14 × 138,810.69
4. Step 4: Simplify right side
   139,640.94x = 28,856,262,598.02
5. Step 5: Solve for x
   x = 28,856,262,598.02/139,640.94
6. Step 6: Final answer
   x = 206,646.15