Finding the Fourth Proportional to 139,388.84, 192,342.72 and 78,947.42

Step by Step Solution

1. Step 1: Write the proportion equation
   139,388.84 : 192,342.72 = 78,947.42 : x
2. Step 2: Convert to fraction form
   139,388.84/192,342.72 = 78,947.42/x
3. Step 3: Cross multiply
   139,388.84x = 192,342.72 × 78,947.42
4. Step 4: Simplify right side
   139,388.84x = 15,184,961,499.78
5. Step 5: Solve for x
   x = 15,184,961,499.78/139,388.84
6. Step 6: Final answer
   x = 108,939.58