Finding the Fourth Proportional to 67,128.72, 100,690.74 and 17,209.32

Step by Step Solution

1. Step 1: Write the proportion equation
   67,128.72 : 100,690.74 = 17,209.32 : x
2. Step 2: Convert to fraction form
   67,128.72/100,690.74 = 17,209.32/x
3. Step 3: Cross multiply
   67,128.72x = 100,690.74 × 17,209.32
4. Step 4: Simplify right side
   67,128.72x = 1,732,819,165.70
5. Step 5: Solve for x
   x = 1,732,819,165.70/67,128.72
6. Step 6: Final answer
   x = 25,813.38