Finding the Fourth Proportional to 139,801.68, 192,928.50 and 76,139.42

Step by Step Solution

1. Step 1: Write the proportion equation
   139,801.68 : 192,928.50 = 76,139.42 : x
2. Step 2: Convert to fraction form
   139,801.68/192,928.50 = 76,139.42/x
3. Step 3: Cross multiply
   139,801.68x = 192,928.50 × 76,139.42
4. Step 4: Simplify right side
   139,801.68x = 14,689,463,126.83
5. Step 5: Solve for x
   x = 14,689,463,126.83/139,801.68
6. Step 6: Final answer
   x = 105,073.58