Finding the Fourth Proportional to 139,633.05, 207,970.69 and 138,952.65

Step by Step Solution

1. Step 1: Write the proportion equation
   139,633.05 : 207,970.69 = 138,952.65 : x
2. Step 2: Convert to fraction form
   139,633.05/207,970.69 = 138,952.65/x
3. Step 3: Cross multiply
   139,633.05x = 207,970.69 × 138,952.65
4. Step 4: Simplify right side
   139,633.05x = 28,898,078,497.83
5. Step 5: Solve for x
   x = 28,898,078,497.83/139,633.05
6. Step 6: Final answer
   x = 206,957.30