Finding the Fourth Proportional to 12,856.78, 17,743.22 and 7,192.05

Step by Step Solution

1. Step 1: Write the proportion equation
   12,856.78 : 17,743.22 = 7,192.05 : x
2. Step 2: Convert to fraction form
   12,856.78/17,743.22 = 7,192.05/x
3. Step 3: Cross multiply
   12,856.78x = 17,743.22 × 7,192.05
4. Step 4: Simplify right side
   12,856.78x = 127,610,125.40
5. Step 5: Solve for x
   x = 127,610,125.40/12,856.78
6. Step 6: Final answer
   x = 9,925.51