Finding the Fourth Proportional to 17,978.40, 24,802.88 and 11,931.50

Step by Step Solution

1. Step 1: Write the proportion equation
   17,978.40 : 24,802.88 = 11,931.50 : x
2. Step 2: Convert to fraction form
   17,978.40/24,802.88 = 11,931.50/x
3. Step 3: Cross multiply
   17,978.40x = 24,802.88 × 11,931.50
4. Step 4: Simplify right side
   17,978.40x = 295,935,379.05
5. Step 5: Solve for x
   x = 295,935,379.05/17,978.40
6. Step 6: Final answer
   x = 16,460.61