Finding the Fourth Proportional to 9,825.48, 13,558.90 and 5,518.45

Step by Step Solution

1. Step 1: Write the proportion equation
   9,825.48 : 13,558.90 = 5,518.45 : x
2. Step 2: Convert to fraction form
   9,825.48/13,558.90 = 5,518.45/x
3. Step 3: Cross multiply
   9,825.48x = 13,558.90 × 5,518.45
4. Step 4: Simplify right side
   9,825.48x = 74,824,111.71
5. Step 5: Solve for x
   x = 74,824,111.71/9,825.48
6. Step 6: Final answer
   x = 7,615.31