Finding the Fourth Proportional to 72,436.53, 108,686 and 39,180

Step by Step Solution

1. Step 1: Write the proportion equation
   72,436.53 : 108,686 = 39,180 : x
2. Step 2: Convert to fraction form
   72,436.53/108,686 = 39,180/x
3. Step 3: Cross multiply
   72,436.53x = 108,686 × 39,180
4. Step 4: Simplify right side
   72,436.53x = 4,258,317,480
5. Step 5: Solve for x
   x = 4,258,317,480/72,436.53
6. Step 6: Final answer
   x = 58,786.88