Finding the Fourth Proportional to 139,408.84, 192,341.82 and 78,969.88

Step by Step Solution

1. Step 1: Write the proportion equation
   139,408.84 : 192,341.82 = 78,969.88 : x
2. Step 2: Convert to fraction form
   139,408.84/192,341.82 = 78,969.88/x
3. Step 3: Cross multiply
   139,408.84x = 192,341.82 × 78,969.88
4. Step 4: Simplify right side
   139,408.84x = 15,189,210,444.38
5. Step 5: Solve for x
   x = 15,189,210,444.38/139,408.84
6. Step 6: Final answer
   x = 108,954.43