Finding the Fourth Proportional to 139,618.44, 207,848.52 and 138,788.10

Step by Step Solution

1. Step 1: Write the proportion equation
   139,618.44 : 207,848.52 = 138,788.10 : x
2. Step 2: Convert to fraction form
   139,618.44/207,848.52 = 138,788.10/x
3. Step 3: Cross multiply
   139,618.44x = 207,848.52 × 138,788.10
4. Step 4: Simplify right side
   139,618.44x = 28,846,901,178.61
5. Step 5: Solve for x
   x = 28,846,901,178.61/139,618.44
6. Step 6: Final answer
   x = 206,612.40