Finding the Fourth Proportional to 139,791.60, 192,920.51 and 105,274.52

Step by Step Solution

1. Step 1: Write the proportion equation
   139,791.60 : 192,920.51 = 105,274.52 : x
2. Step 2: Convert to fraction form
   139,791.60/192,920.51 = 105,274.52/x
3. Step 3: Cross multiply
   139,791.60x = 192,920.51 × 105,274.52
4. Step 4: Simplify right side
   139,791.60x = 20,309,614,088.41
5. Step 5: Solve for x
   x = 20,309,614,088.41/139,791.60
6. Step 6: Final answer
   x = 145,284.94