Finding the Fourth Proportional to 139,109.25, 208,593.72 and 99,105.39

Step by Step Solution

1. Step 1: Write the proportion equation
   139,109.25 : 208,593.72 = 99,105.39 : x
2. Step 2: Convert to fraction form
   139,109.25/208,593.72 = 99,105.39/x
3. Step 3: Cross multiply
   139,109.25x = 208,593.72 × 99,105.39
4. Step 4: Simplify right side
   139,109.25x = 20,672,761,972.15
5. Step 5: Solve for x
   x = 20,672,761,972.15/139,109.25
6. Step 6: Final answer
   x = 148,608.10