Finding the Fourth Proportional to 139,641.59, 192,725.16 and 79,227.20

Step by Step Solution

1. Step 1: Write the proportion equation
   139,641.59 : 192,725.16 = 79,227.20 : x
2. Step 2: Convert to fraction form
   139,641.59/192,725.16 = 79,227.20/x
3. Step 3: Cross multiply
   139,641.59x = 192,725.16 × 79,227.20
4. Step 4: Simplify right side
   139,641.59x = 15,269,074,796.35
5. Step 5: Solve for x
   x = 15,269,074,796.35/139,641.59
6. Step 6: Final answer
   x = 109,344.75