Finding the Fourth Proportional to 139,174.65, 192,059.91 and 78,744.78

Step by Step Solution

1. Step 1: Write the proportion equation
   139,174.65 : 192,059.91 = 78,744.78 : x
2. Step 2: Convert to fraction form
   139,174.65/192,059.91 = 78,744.78/x
3. Step 3: Cross multiply
   139,174.65x = 192,059.91 × 78,744.78
4. Step 4: Simplify right side
   139,174.65x = 15,123,715,359.77
5. Step 5: Solve for x
   x = 15,123,715,359.77/139,174.65
6. Step 6: Final answer
   x = 108,667.17