Finding the Fourth Proportional to 70,647.39, 105,987.49 and 20,725.47

Step by Step Solution

1. Step 1: Write the proportion equation
   70,647.39 : 105,987.49 = 20,725.47 : x
2. Step 2: Convert to fraction form
   70,647.39/105,987.49 = 20,725.47/x
3. Step 3: Cross multiply
   70,647.39x = 105,987.49 × 20,725.47
4. Step 4: Simplify right side
   70,647.39x = 2,196,640,492.56
5. Step 5: Solve for x
   x = 2,196,640,492.56/70,647.39
6. Step 6: Final answer
   x = 31,093.02