Finding the Fourth Proportional to 139,172.17, 209,003.78 and 103,643.14

Step by Step Solution

1. Step 1: Write the proportion equation
   139,172.17 : 209,003.78 = 103,643.14 : x
2. Step 2: Convert to fraction form
   139,172.17/209,003.78 = 103,643.14/x
3. Step 3: Cross multiply
   139,172.17x = 209,003.78 × 103,643.14
4. Step 4: Simplify right side
   139,172.17x = 21,661,808,031.07
5. Step 5: Solve for x
   x = 21,661,808,031.07/139,172.17
6. Step 6: Final answer
   x = 155,647.56