Finding the Fourth Proportional to 139,195.05, 192,086.50 and 78,764.59

Step by Step Solution

1. Step 1: Write the proportion equation
   139,195.05 : 192,086.50 = 78,764.59 : x
2. Step 2: Convert to fraction form
   139,195.05/192,086.50 = 78,764.59/x
3. Step 3: Cross multiply
   139,195.05x = 192,086.50 × 78,764.59
4. Step 4: Simplify right side
   139,195.05x = 15,129,614,417.04
5. Step 5: Solve for x
   x = 15,129,614,417.04/139,195.05
6. Step 6: Final answer
   x = 108,693.62