Finding the Fourth Proportional to 139,971.63, 209,914.38 and 40,105.07

Step by Step Solution

1. Step 1: Write the proportion equation
   139,971.63 : 209,914.38 = 40,105.07 : x
2. Step 2: Convert to fraction form
   139,971.63/209,914.38 = 40,105.07/x
3. Step 3: Cross multiply
   139,971.63x = 209,914.38 × 40,105.07
4. Step 4: Simplify right side
   139,971.63x = 8,418,629,854.33
5. Step 5: Solve for x
   x = 8,418,629,854.33/139,971.63
6. Step 6: Final answer
   x = 60,145.26