Finding the Fourth Proportional to 139,401.96, 209,208.09 and 64,574.60

Step by Step Solution

1. Step 1: Write the proportion equation
   139,401.96 : 209,208.09 = 64,574.60 : x
2. Step 2: Convert to fraction form
   139,401.96/209,208.09 = 64,574.60/x
3. Step 3: Cross multiply
   139,401.96x = 209,208.09 × 64,574.60
4. Step 4: Simplify right side
   139,401.96x = 13,509,528,728.51
5. Step 5: Solve for x
   x = 13,509,528,728.51/139,401.96
6. Step 6: Final answer
   x = 96,910.61