Finding the Fourth Proportional to 139,170.42, 209,001.15 and 103,641.39

Step by Step Solution

1. Step 1: Write the proportion equation
   139,170.42 : 209,001.15 = 103,641.39 : x
2. Step 2: Convert to fraction form
   139,170.42/209,001.15 = 103,641.39/x
3. Step 3: Cross multiply
   139,170.42x = 209,001.15 × 103,641.39
4. Step 4: Simplify right side
   139,170.42x = 21,661,169,697.60
5. Step 5: Solve for x
   x = 21,661,169,697.60/139,170.42
6. Step 6: Final answer
   x = 155,644.93