Finding the Fourth Proportional to 9,147.10, 12,621.32 and 5,370.42

Step by Step Solution

1. Step 1: Write the proportion equation
   9,147.10 : 12,621.32 = 5,370.42 : x
2. Step 2: Convert to fraction form
   9,147.10/12,621.32 = 5,370.42/x
3. Step 3: Cross multiply
   9,147.10x = 12,621.32 × 5,370.42
4. Step 4: Simplify right side
   9,147.10x = 67,781,789.35
5. Step 5: Solve for x
   x = 67,781,789.35/9,147.10
6. Step 6: Final answer
   x = 7,410.19