Finding the Fourth Proportional to 139,172.17, 208,795.92 and 99,241.60

Step by Step Solution

1. Step 1: Write the proportion equation
   139,172.17 : 208,795.92 = 99,241.60 : x
2. Step 2: Convert to fraction form
   139,172.17/208,795.92 = 99,241.60/x
3. Step 3: Cross multiply
   139,172.17x = 208,795.92 × 99,241.60
4. Step 4: Simplify right side
   139,172.17x = 20,721,241,174.27
5. Step 5: Solve for x
   x = 20,721,241,174.27/139,172.17
6. Step 6: Final answer
   x = 148,889.26