Finding the Fourth Proportional to 9,001.48, 12,420.12 and 5,642.68

Step by Step Solution

1. Step 1: Write the proportion equation
   9,001.48 : 12,420.12 = 5,642.68 : x
2. Step 2: Convert to fraction form
   9,001.48/12,420.12 = 5,642.68/x
3. Step 3: Cross multiply
   9,001.48x = 12,420.12 × 5,642.68
4. Step 4: Simplify right side
   9,001.48x = 70,082,762.72
5. Step 5: Solve for x
   x = 70,082,762.72/9,001.48
6. Step 6: Final answer
   x = 7,785.69