Finding the Fourth Proportional to 17,878.21, 24,671.55 and 9,920.26

Step by Step Solution

1. Step 1: Write the proportion equation
   17,878.21 : 24,671.55 = 9,920.26 : x
2. Step 2: Convert to fraction form
   17,878.21/24,671.55 = 9,920.26/x
3. Step 3: Cross multiply
   17,878.21x = 24,671.55 × 9,920.26
4. Step 4: Simplify right side
   17,878.21x = 244,748,190.60
5. Step 5: Solve for x
   x = 244,748,190.60/17,878.21
6. Step 6: Final answer
   x = 13,689.75