Finding the Fourth Proportional to 17,111.19, 23,624.56 and 15,315.56

Step by Step Solution

1. Step 1: Write the proportion equation
   17,111.19 : 23,624.56 = 15,315.56 : x
2. Step 2: Convert to fraction form
   17,111.19/23,624.56 = 15,315.56/x
3. Step 3: Cross multiply
   17,111.19x = 23,624.56 × 15,315.56
4. Step 4: Simplify right side
   17,111.19x = 361,823,366.15
5. Step 5: Solve for x
   x = 361,823,366.15/17,111.19
6. Step 6: Final answer
   x = 21,145.42