Finding the Fourth Proportional to 139,836.01, 192,959.31 and 78,572.47

Step by Step Solution

1. Step 1: Write the proportion equation
   139,836.01 : 192,959.31 = 78,572.47 : x
2. Step 2: Convert to fraction form
   139,836.01/192,959.31 = 78,572.47/x
3. Step 3: Cross multiply
   139,836.01x = 192,959.31 × 78,572.47
4. Step 4: Simplify right side
   139,836.01x = 15,161,289,596.20
5. Step 5: Solve for x
   x = 15,161,289,596.20/139,836.01
6. Step 6: Final answer
   x = 108,421.93