Finding the Fourth Proportional to 9,346.72, 12,898.57 and 5,155.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,346.72 : 12,898.57 = 5,155.12 : x
2. Step 2: Convert to fraction form
   9,346.72/12,898.57 = 5,155.12/x
3. Step 3: Cross multiply
   9,346.72x = 12,898.57 × 5,155.12
4. Step 4: Simplify right side
   9,346.72x = 66,493,676.18
5. Step 5: Solve for x
   x = 66,493,676.18/9,346.72
6. Step 6: Final answer
   x = 7,114.12