Finding the Fourth Proportional to 139,632.05, 207,969.20 and 138,951.65

Step by Step Solution

1. Step 1: Write the proportion equation
   139,632.05 : 207,969.20 = 138,951.65 : x
2. Step 2: Convert to fraction form
   139,632.05/207,969.20 = 138,951.65/x
3. Step 3: Cross multiply
   139,632.05x = 207,969.20 × 138,951.65
4. Step 4: Simplify right side
   139,632.05x = 28,897,664,617.02
5. Step 5: Solve for x
   x = 28,897,664,617.02/139,632.05
6. Step 6: Final answer
   x = 206,955.81