Finding the Fourth Proportional to 139,311.36, 209,002.41 and 64,485.48

Step by Step Solution

1. Step 1: Write the proportion equation
   139,311.36 : 209,002.41 = 64,485.48 : x
2. Step 2: Convert to fraction form
   139,311.36/209,002.41 = 64,485.48/x
3. Step 3: Cross multiply
   139,311.36x = 209,002.41 × 64,485.48
4. Step 4: Simplify right side
   139,311.36x = 13,477,620,730.01
5. Step 5: Solve for x
   x = 13,477,620,730.01/139,311.36
6. Step 6: Final answer
   x = 96,744.59