Finding the Fourth Proportional to 17,656.12, 26,443.86 and 8,428.60

Step by Step Solution

1. Step 1: Write the proportion equation
   17,656.12 : 26,443.86 = 8,428.60 : x
2. Step 2: Convert to fraction form
   17,656.12/26,443.86 = 8,428.60/x
3. Step 3: Cross multiply
   17,656.12x = 26,443.86 × 8,428.60
4. Step 4: Simplify right side
   17,656.12x = 222,884,718.40
5. Step 5: Solve for x
   x = 222,884,718.40/17,656.12
6. Step 6: Final answer
   x = 12,623.65