Finding the Fourth Proportional to 139,562.71, 192,592.42 and 79,138.87

Step by Step Solution

1. Step 1: Write the proportion equation
   139,562.71 : 192,592.42 = 79,138.87 : x
2. Step 2: Convert to fraction form
   139,562.71/192,592.42 = 79,138.87/x
3. Step 3: Cross multiply
   139,562.71x = 192,592.42 × 79,138.87
4. Step 4: Simplify right side
   139,562.71x = 15,241,546,489.37
5. Step 5: Solve for x
   x = 15,241,546,489.37/139,562.71
6. Step 6: Final answer
   x = 109,209.30