Finding the Fourth Proportional to 12,997.30, 19,462.74 and 7,147.48

Step by Step Solution

1. Step 1: Write the proportion equation
   12,997.30 : 19,462.74 = 7,147.48 : x
2. Step 2: Convert to fraction form
   12,997.30/19,462.74 = 7,147.48/x
3. Step 3: Cross multiply
   12,997.30x = 19,462.74 × 7,147.48
4. Step 4: Simplify right side
   12,997.30x = 139,109,544.90
5. Step 5: Solve for x
   x = 139,109,544.90/12,997.30
6. Step 6: Final answer
   x = 10,702.96