Finding the Fourth Proportional to 17,455.53, 23,931.57 and 17,139.63

Step by Step Solution

1. Step 1: Write the proportion equation
   17,455.53 : 23,931.57 = 17,139.63 : x
2. Step 2: Convert to fraction form
   17,455.53/23,931.57 = 17,139.63/x
3. Step 3: Cross multiply
   17,455.53x = 23,931.57 × 17,139.63
4. Step 4: Simplify right side
   17,455.53x = 410,178,255.12
5. Step 5: Solve for x
   x = 410,178,255.12/17,455.53
6. Step 6: Final answer
   x = 23,498.47