Finding the Fourth Proportional to 9,878.22, 13,631.90 and 5,401.89

Step by Step Solution

1. Step 1: Write the proportion equation
   9,878.22 : 13,631.90 = 5,401.89 : x
2. Step 2: Convert to fraction form
   9,878.22/13,631.90 = 5,401.89/x
3. Step 3: Cross multiply
   9,878.22x = 13,631.90 × 5,401.89
4. Step 4: Simplify right side
   9,878.22x = 73,637,997.28
5. Step 5: Solve for x
   x = 73,637,997.28/9,878.22
6. Step 6: Final answer
   x = 7,454.58