Finding the Fourth Proportional to 139,173.17, 209,005.28 and 103,644.14

Step by Step Solution

1. Step 1: Write the proportion equation
   139,173.17 : 209,005.28 = 103,644.14 : x
2. Step 2: Convert to fraction form
   139,173.17/209,005.28 = 103,644.14/x
3. Step 3: Cross multiply
   139,173.17x = 209,005.28 × 103,644.14
4. Step 4: Simplify right side
   139,173.17x = 21,662,172,501.06
5. Step 5: Solve for x
   x = 21,662,172,501.06/139,173.17
6. Step 6: Final answer
   x = 155,649.06