Finding the Fourth Proportional to 139,404.18, 209,123.55 and 45,942.42

Step by Step Solution

1. Step 1: Write the proportion equation
   139,404.18 : 209,123.55 = 45,942.42 : x
2. Step 2: Convert to fraction form
   139,404.18/209,123.55 = 45,942.42/x
3. Step 3: Cross multiply
   139,404.18x = 209,123.55 × 45,942.42
4. Step 4: Simplify right side
   139,404.18x = 9,607,641,965.99
5. Step 5: Solve for x
   x = 9,607,641,965.99/139,404.18
6. Step 6: Final answer
   x = 68,919.32