Finding the Fourth Proportional to 139,383.48, 208,951.28 and 60,454.64

Step by Step Solution

1. Step 1: Write the proportion equation
   139,383.48 : 208,951.28 = 60,454.64 : x
2. Step 2: Convert to fraction form
   139,383.48/208,951.28 = 60,454.64/x
3. Step 3: Cross multiply
   139,383.48x = 208,951.28 × 60,454.64
4. Step 4: Simplify right side
   139,383.48x = 12,632,074,409.94
5. Step 5: Solve for x
   x = 12,632,074,409.94/139,383.48
6. Step 6: Final answer
   x = 90,628.20