Finding the Fourth Proportional to 139,357.87, 192,393.53 and 91,749.61

Step by Step Solution

1. Step 1: Write the proportion equation
   139,357.87 : 192,393.53 = 91,749.61 : x
2. Step 2: Convert to fraction form
   139,357.87/192,393.53 = 91,749.61/x
3. Step 3: Cross multiply
   139,357.87x = 192,393.53 × 91,749.61
4. Step 4: Simplify right side
   139,357.87x = 17,652,031,469.83
5. Step 5: Solve for x
   x = 17,652,031,469.83/139,357.87
6. Step 6: Final answer
   x = 126,666.92