Finding the Fourth Proportional to 9,404.69, 12,978.62 and 5,156.16

Step by Step Solution

1. Step 1: Write the proportion equation
   9,404.69 : 12,978.62 = 5,156.16 : x
2. Step 2: Convert to fraction form
   9,404.69/12,978.62 = 5,156.16/x
3. Step 3: Cross multiply
   9,404.69x = 12,978.62 × 5,156.16
4. Step 4: Simplify right side
   9,404.69x = 66,919,815.52
5. Step 5: Solve for x
   x = 66,919,815.52/9,404.69
6. Step 6: Final answer
   x = 7,115.58