Finding the Fourth Proportional to 9,418.86, 12,997.46 and 5,643.98

Step by Step Solution

1. Step 1: Write the proportion equation
   9,418.86 : 12,997.46 = 5,643.98 : x
2. Step 2: Convert to fraction form
   9,418.86/12,997.46 = 5,643.98/x
3. Step 3: Cross multiply
   9,418.86x = 12,997.46 × 5,643.98
4. Step 4: Simplify right side
   9,418.86x = 73,357,404.29
5. Step 5: Solve for x
   x = 73,357,404.29/9,418.86
6. Step 6: Final answer
   x = 7,788.35