Finding the Fourth Proportional to 9,055.57, 12,496.71 and 5,278.45

Step by Step Solution

1. Step 1: Write the proportion equation
   9,055.57 : 12,496.71 = 5,278.45 : x
2. Step 2: Convert to fraction form
   9,055.57/12,496.71 = 5,278.45/x
3. Step 3: Cross multiply
   9,055.57x = 12,496.71 × 5,278.45
4. Step 4: Simplify right side
   9,055.57x = 65,963,258.90
5. Step 5: Solve for x
   x = 65,963,258.90/9,055.57
6. Step 6: Final answer
   x = 7,284.27