Finding the Fourth Proportional to 139,835.01, 192,957.93 and 78,571.47

Step by Step Solution

1. Step 1: Write the proportion equation
   139,835.01 : 192,957.93 = 78,571.47 : x
2. Step 2: Convert to fraction form
   139,835.01/192,957.93 = 78,571.47/x
3. Step 3: Cross multiply
   139,835.01x = 192,957.93 × 78,571.47
4. Step 4: Simplify right side
   139,835.01x = 15,160,987,846.46
5. Step 5: Solve for x
   x = 15,160,987,846.46/139,835.01
6. Step 6: Final answer
   x = 108,420.55