Finding the Fourth Proportional to 9,404.62, 12,978.52 and 5,156.09

Step by Step Solution

1. Step 1: Write the proportion equation
   9,404.62 : 12,978.52 = 5,156.09 : x
2. Step 2: Convert to fraction form
   9,404.62/12,978.52 = 5,156.09/x
3. Step 3: Cross multiply
   9,404.62x = 12,978.52 × 5,156.09
4. Step 4: Simplify right side
   9,404.62x = 66,918,339.40
5. Step 5: Solve for x
   x = 66,918,339.40/9,404.62
6. Step 6: Final answer
   x = 7,115.48