Finding the Fourth Proportional to 70,409.31, 105,617.60 and 17,819.25

Step by Step Solution

1. Step 1: Write the proportion equation
   70,409.31 : 105,617.60 = 17,819.25 : x
2. Step 2: Convert to fraction form
   70,409.31/105,617.60 = 17,819.25/x
3. Step 3: Cross multiply
   70,409.31x = 105,617.60 × 17,819.25
4. Step 4: Simplify right side
   70,409.31x = 1,882,026,418.80
5. Step 5: Solve for x
   x = 1,882,026,418.80/70,409.31
6. Step 6: Final answer
   x = 26,729.79