Finding the Fourth Proportional to 139,245.72, 209,042.16 and 138,606

Step by Step Solution

1. Step 1: Write the proportion equation
   139,245.72 : 209,042.16 = 138,606 : x
2. Step 2: Convert to fraction form
   139,245.72/209,042.16 = 138,606/x
3. Step 3: Cross multiply
   139,245.72x = 209,042.16 × 138,606
4. Step 4: Simplify right side
   139,245.72x = 28,974,497,628.96
5. Step 5: Solve for x
   x = 28,974,497,628.96/139,245.72
6. Step 6: Final answer
   x = 208,081.78