Finding the Fourth Proportional to 9,304.78, 12,840.38 and 5,055.74

Step by Step Solution

1. Step 1: Write the proportion equation
   9,304.78 : 12,840.38 = 5,055.74 : x
2. Step 2: Convert to fraction form
   9,304.78/12,840.38 = 5,055.74/x
3. Step 3: Cross multiply
   9,304.78x = 12,840.38 × 5,055.74
4. Step 4: Simplify right side
   9,304.78x = 64,917,622.78
5. Step 5: Solve for x
   x = 64,917,622.78/9,304.78
6. Step 6: Final answer
   x = 6,976.80