Finding the Fourth Proportional to 9,918.72, 13,688.04 and 5,442.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,918.72 : 13,688.04 = 5,442.21 : x
2. Step 2: Convert to fraction form
   9,918.72/13,688.04 = 5,442.21/x
3. Step 3: Cross multiply
   9,918.72x = 13,688.04 × 5,442.21
4. Step 4: Simplify right side
   9,918.72x = 74,493,188.17
5. Step 5: Solve for x
   x = 74,493,188.17/9,918.72
6. Step 6: Final answer
   x = 7,510.36