Finding the Fourth Proportional to 9,900.86, 13,662.99 and 5,424.59

Step by Step Solution

1. Step 1: Write the proportion equation
   9,900.86 : 13,662.99 = 5,424.59 : x
2. Step 2: Convert to fraction form
   9,900.86/13,662.99 = 5,424.59/x
3. Step 3: Cross multiply
   9,900.86x = 13,662.99 × 5,424.59
4. Step 4: Simplify right side
   9,900.86x = 74,116,153.08
5. Step 5: Solve for x
   x = 74,116,153.08/9,900.86
6. Step 6: Final answer
   x = 7,485.83