Finding the Fourth Proportional to 139,568.81, 192,561.50 and 79,134.71

Step by Step Solution

1. Step 1: Write the proportion equation
   139,568.81 : 192,561.50 = 79,134.71 : x
2. Step 2: Convert to fraction form
   139,568.81/192,561.50 = 79,134.71/x
3. Step 3: Cross multiply
   139,568.81x = 192,561.50 × 79,134.71
4. Step 4: Simplify right side
   139,568.81x = 15,238,298,459.67
5. Step 5: Solve for x
   x = 15,238,298,459.67/139,568.81
6. Step 6: Final answer
   x = 109,181.26