Finding the Fourth Proportional to 139,968.48, 193,162.56 and 76,309.92

Step by Step Solution

1. Step 1: Write the proportion equation
   139,968.48 : 193,162.56 = 76,309.92 : x
2. Step 2: Convert to fraction form
   139,968.48/193,162.56 = 76,309.92/x
3. Step 3: Cross multiply
   139,968.48x = 193,162.56 × 76,309.92
4. Step 4: Simplify right side
   139,968.48x = 14,740,219,500.60
5. Step 5: Solve for x
   x = 14,740,219,500.60/139,968.48
6. Step 6: Final answer
   x = 105,310.99