Finding the Fourth Proportional to 139,171.92, 208,795.55 and 99,241.35

Step by Step Solution

1. Step 1: Write the proportion equation
   139,171.92 : 208,795.55 = 99,241.35 : x
2. Step 2: Convert to fraction form
   139,171.92/208,795.55 = 99,241.35/x
3. Step 3: Cross multiply
   139,171.92x = 208,795.55 × 99,241.35
4. Step 4: Simplify right side
   139,171.92x = 20,721,151,759.79
5. Step 5: Solve for x
   x = 20,721,151,759.79/139,171.92
6. Step 6: Final answer
   x = 148,888.88