Finding the Fourth Proportional to 12,569.42, 17,345.85 and 7,856.39

Step by Step Solution

1. Step 1: Write the proportion equation
   12,569.42 : 17,345.85 = 7,856.39 : x
2. Step 2: Convert to fraction form
   12,569.42/17,345.85 = 7,856.39/x
3. Step 3: Cross multiply
   12,569.42x = 17,345.85 × 7,856.39
4. Step 4: Simplify right side
   12,569.42x = 136,275,762.48
5. Step 5: Solve for x
   x = 136,275,762.48/12,569.42
6. Step 6: Final answer
   x = 10,841.85