Finding the Fourth Proportional to 12,904.28, 17,789.91 and 8,656.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,904.28 : 17,789.91 = 8,656.10 : x
2. Step 2: Convert to fraction form
   12,904.28/17,789.91 = 8,656.10/x
3. Step 3: Cross multiply
   12,904.28x = 17,789.91 × 8,656.10
4. Step 4: Simplify right side
   12,904.28x = 153,991,239.95
5. Step 5: Solve for x
   x = 153,991,239.95/12,904.28
6. Step 6: Final answer
   x = 11,933.35