Finding the Fourth Proportional to 12,904, 19,364.56 and 7,064.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,904 : 19,364.56 = 7,064.72 : x
2. Step 2: Convert to fraction form
   12,904/19,364.56 = 7,064.72/x
3. Step 3: Cross multiply
   12,904x = 19,364.56 × 7,064.72
4. Step 4: Simplify right side
   12,904x = 136,805,194.32
5. Step 5: Solve for x
   x = 136,805,194.32/12,904
6. Step 6: Final answer
   x = 10,601.77