Finding the Fourth Proportional to 139,820.34, 192,958.90 and 79,389.89

Step by Step Solution

1. Step 1: Write the proportion equation
   139,820.34 : 192,958.90 = 79,389.89 : x
2. Step 2: Convert to fraction form
   139,820.34/192,958.90 = 79,389.89/x
3. Step 3: Cross multiply
   139,820.34x = 192,958.90 × 79,389.89
4. Step 4: Simplify right side
   139,820.34x = 15,318,985,845.52
5. Step 5: Solve for x
   x = 15,318,985,845.52/139,820.34
6. Step 6: Final answer
   x = 109,561.93