Finding the Fourth Proportional to 9,918.21, 13,687.43 and 5,442.24

Step by Step Solution

1. Step 1: Write the proportion equation
   9,918.21 : 13,687.43 = 5,442.24 : x
2. Step 2: Convert to fraction form
   9,918.21/13,687.43 = 5,442.24/x
3. Step 3: Cross multiply
   9,918.21x = 13,687.43 × 5,442.24
4. Step 4: Simplify right side
   9,918.21x = 74,490,279.04
5. Step 5: Solve for x
   x = 74,490,279.04/9,918.21
6. Step 6: Final answer
   x = 7,510.46