Finding the Fourth Proportional to 18,111.40, 27,171.72 and 5,631.53

Step by Step Solution

1. Step 1: Write the proportion equation
   18,111.40 : 27,171.72 = 5,631.53 : x
2. Step 2: Convert to fraction form
   18,111.40/27,171.72 = 5,631.53/x
3. Step 3: Cross multiply
   18,111.40x = 27,171.72 × 5,631.53
4. Step 4: Simplify right side
   18,111.40x = 153,018,356.33
5. Step 5: Solve for x
   x = 153,018,356.33/18,111.40
6. Step 6: Final answer
   x = 8,448.73