Finding the Fourth Proportional to 10,890.48, 15,018.66 and 7,109.40

Step by Step Solution

1. Step 1: Write the proportion equation
   10,890.48 : 15,018.66 = 7,109.40 : x
2. Step 2: Convert to fraction form
   10,890.48/15,018.66 = 7,109.40/x
3. Step 3: Cross multiply
   10,890.48x = 15,018.66 × 7,109.40
4. Step 4: Simplify right side
   10,890.48x = 106,773,661.40
5. Step 5: Solve for x
   x = 106,773,661.40/10,890.48
6. Step 6: Final answer
   x = 9,804.31