Finding the Fourth Proportional to 139,788.52, 209,668.20 and 39,942.25

Step by Step Solution

1. Step 1: Write the proportion equation
   139,788.52 : 209,668.20 = 39,942.25 : x
2. Step 2: Convert to fraction form
   139,788.52/209,668.20 = 39,942.25/x
3. Step 3: Cross multiply
   139,788.52x = 209,668.20 × 39,942.25
4. Step 4: Simplify right side
   139,788.52x = 8,374,619,661.45
5. Step 5: Solve for x
   x = 8,374,619,661.45/139,788.52
6. Step 6: Final answer
   x = 59,909.21