Finding the Fourth Proportional to 139,431.82, 208,976.40 and 64,450.52

Step by Step Solution

1. Step 1: Write the proportion equation
   139,431.82 : 208,976.40 = 64,450.52 : x
2. Step 2: Convert to fraction form
   139,431.82/208,976.40 = 64,450.52/x
3. Step 3: Cross multiply
   139,431.82x = 208,976.40 × 64,450.52
4. Step 4: Simplify right side
   139,431.82x = 13,468,637,647.73
5. Step 5: Solve for x
   x = 13,468,637,647.73/139,431.82
6. Step 6: Final answer
   x = 96,596.58