Finding the Fourth Proportional to 17,377.98, 23,981.61 and 9,420.21

Step by Step Solution

1. Step 1: Write the proportion equation
   17,377.98 : 23,981.61 = 9,420.21 : x
2. Step 2: Convert to fraction form
   17,377.98/23,981.61 = 9,420.21/x
3. Step 3: Cross multiply
   17,377.98x = 23,981.61 × 9,420.21
4. Step 4: Simplify right side
   17,377.98x = 225,911,802.34
5. Step 5: Solve for x
   x = 225,911,802.34/17,377.98
6. Step 6: Final answer
   x = 12,999.89