Finding the Fourth Proportional to 139,731.78, 192,818.78 and 79,302.42

Step by Step Solution

1. Step 1: Write the proportion equation
   139,731.78 : 192,818.78 = 79,302.42 : x
2. Step 2: Convert to fraction form
   139,731.78/192,818.78 = 79,302.42/x
3. Step 3: Cross multiply
   139,731.78x = 192,818.78 × 79,302.42
4. Step 4: Simplify right side
   139,731.78x = 15,290,995,875.45
5. Step 5: Solve for x
   x = 15,290,995,875.45/139,731.78
6. Step 6: Final answer
   x = 109,431.05