Finding the Fourth Proportional to 7,478.06, 11,128.82 and 7,228.91

Step by Step Solution

1. Step 1: Write the proportion equation
   7,478.06 : 11,128.82 = 7,228.91 : x
2. Step 2: Convert to fraction form
   7,478.06/11,128.82 = 7,228.91/x
3. Step 3: Cross multiply
   7,478.06x = 11,128.82 × 7,228.91
4. Step 4: Simplify right side
   7,478.06x = 80,449,146.40
5. Step 5: Solve for x
   x = 80,449,146.40/7,478.06
6. Step 6: Final answer
   x = 10,758.03