Finding the Fourth Proportional to 139,895.02, 209,678.15 and 64,857.23

Step by Step Solution

1. Step 1: Write the proportion equation
   139,895.02 : 209,678.15 = 64,857.23 : x
2. Step 2: Convert to fraction form
   139,895.02/209,678.15 = 64,857.23/x
3. Step 3: Cross multiply
   139,895.02x = 209,678.15 × 64,857.23
4. Step 4: Simplify right side
   139,895.02x = 13,599,143,900.57
5. Step 5: Solve for x
   x = 13,599,143,900.57/139,895.02
6. Step 6: Final answer
   x = 97,209.63