Finding the Fourth Proportional to 12,997.80, 19,463.49 and 7,147.98

Step by Step Solution

1. Step 1: Write the proportion equation
   12,997.80 : 19,463.49 = 7,147.98 : x
2. Step 2: Convert to fraction form
   12,997.80/19,463.49 = 7,147.98/x
3. Step 3: Cross multiply
   12,997.80x = 19,463.49 × 7,147.98
4. Step 4: Simplify right side
   12,997.80x = 139,124,637.25
5. Step 5: Solve for x
   x = 139,124,637.25/12,997.80
6. Step 6: Final answer
   x = 10,703.71