Finding the Fourth Proportional to 139,920.33, 209,910.38 and 45,155.91

Step by Step Solution

1. Step 1: Write the proportion equation
   139,920.33 : 209,910.38 = 45,155.91 : x
2. Step 2: Convert to fraction form
   139,920.33/209,910.38 = 45,155.91/x
3. Step 3: Cross multiply
   139,920.33x = 209,910.38 × 45,155.91
4. Step 4: Simplify right side
   139,920.33x = 9,478,694,227.35
5. Step 5: Solve for x
   x = 9,478,694,227.35/139,920.33
6. Step 6: Final answer
   x = 67,743.51