Finding the Fourth Proportional to 21,173.16, 31,698.18 and 18,353.55

Step by Step Solution

1. Step 1: Write the proportion equation
   21,173.16 : 31,698.18 = 18,353.55 : x
2. Step 2: Convert to fraction form
   21,173.16/31,698.18 = 18,353.55/x
3. Step 3: Cross multiply
   21,173.16x = 31,698.18 × 18,353.55
4. Step 4: Simplify right side
   21,173.16x = 581,774,131.54
5. Step 5: Solve for x
   x = 581,774,131.54/21,173.16
6. Step 6: Final answer
   x = 27,476.96