Finding the Fourth Proportional to 9,918.99, 13,688.20 and 5,442.77

Step by Step Solution

1. Step 1: Write the proportion equation
   9,918.99 : 13,688.20 = 5,442.77 : x
2. Step 2: Convert to fraction form
   9,918.99/13,688.20 = 5,442.77/x
3. Step 3: Cross multiply
   9,918.99x = 13,688.20 × 5,442.77
4. Step 4: Simplify right side
   9,918.99x = 74,501,724.31
5. Step 5: Solve for x
   x = 74,501,724.31/9,918.99
6. Step 6: Final answer
   x = 7,511.02