Finding the Fourth Proportional to 139,789.65, 209,604.52 and 64,871.26

Step by Step Solution

1. Step 1: Write the proportion equation
   139,789.65 : 209,604.52 = 64,871.26 : x
2. Step 2: Convert to fraction form
   139,789.65/209,604.52 = 64,871.26/x
3. Step 3: Cross multiply
   139,789.65x = 209,604.52 × 64,871.26
4. Step 4: Simplify right side
   139,789.65x = 13,597,309,314.10
5. Step 5: Solve for x
   x = 13,597,309,314.10/139,789.65
6. Step 6: Final answer
   x = 97,269.79