Finding the Fourth Proportional to 139,900.24, 209,883.21 and 55,665.21

Step by Step Solution

1. Step 1: Write the proportion equation
   139,900.24 : 209,883.21 = 55,665.21 : x
2. Step 2: Convert to fraction form
   139,900.24/209,883.21 = 55,665.21/x
3. Step 3: Cross multiply
   139,900.24x = 209,883.21 × 55,665.21
4. Step 4: Simplify right side
   139,900.24x = 11,683,192,960.12
5. Step 5: Solve for x
   x = 11,683,192,960.12/139,900.24
6. Step 6: Final answer
   x = 83,510.89