Finding the Fourth Proportional to 9,392.64, 12,961.86 and 5,085.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,392.64 : 12,961.86 = 5,085.78 : x
2. Step 2: Convert to fraction form
   9,392.64/12,961.86 = 5,085.78/x
3. Step 3: Cross multiply
   9,392.64x = 12,961.86 × 5,085.78
4. Step 4: Simplify right side
   9,392.64x = 65,921,168.35
5. Step 5: Solve for x
   x = 65,921,168.35/9,392.64
6. Step 6: Final answer
   x = 7,018.39