Finding the Fourth Proportional to 139,320.90, 192,293.46 and 91,578.69

Step by Step Solution

1. Step 1: Write the proportion equation
   139,320.90 : 192,293.46 = 91,578.69 : x
2. Step 2: Convert to fraction form
   139,320.90/192,293.46 = 91,578.69/x
3. Step 3: Cross multiply
   139,320.90x = 192,293.46 × 91,578.69
4. Step 4: Simplify right side
   139,320.90x = 17,609,983,162.37
5. Step 5: Solve for x
   x = 17,609,983,162.37/139,320.90
6. Step 6: Final answer
   x = 126,398.72