Finding the Fourth Proportional to 139,420.49, 209,013.17 and 60,475.28

Step by Step Solution

1. Step 1: Write the proportion equation
   139,420.49 : 209,013.17 = 60,475.28 : x
2. Step 2: Convert to fraction form
   139,420.49/209,013.17 = 60,475.28/x
3. Step 3: Cross multiply
   139,420.49x = 209,013.17 × 60,475.28
4. Step 4: Simplify right side
   139,420.49x = 12,640,128,632.00
5. Step 5: Solve for x
   x = 12,640,128,632.00/139,420.49
6. Step 6: Final answer
   x = 90,661.92