Finding the Fourth Proportional to 139,906.29, 209,889.43 and 45,141.89

Step by Step Solution

1. Step 1: Write the proportion equation
   139,906.29 : 209,889.43 = 45,141.89 : x
2. Step 2: Convert to fraction form
   139,906.29/209,889.43 = 45,141.89/x
3. Step 3: Cross multiply
   139,906.29x = 209,889.43 × 45,141.89
4. Step 4: Simplify right side
   139,906.29x = 9,474,805,579.55
5. Step 5: Solve for x
   x = 9,474,805,579.55/139,906.29
6. Step 6: Final answer
   x = 67,722.51