Finding the Fourth Proportional to 9,404.44, 12,978.28 and 5,155.90

Step by Step Solution

1. Step 1: Write the proportion equation
   9,404.44 : 12,978.28 = 5,155.90 : x
2. Step 2: Convert to fraction form
   9,404.44/12,978.28 = 5,155.90/x
3. Step 3: Cross multiply
   9,404.44x = 12,978.28 × 5,155.90
4. Step 4: Simplify right side
   9,404.44x = 66,914,713.85
5. Step 5: Solve for x
   x = 66,914,713.85/9,404.44
6. Step 6: Final answer
   x = 7,115.23