Finding the Fourth Proportional to 9,878.09, 13,631.56 and 5,401.79

Step by Step Solution

1. Step 1: Write the proportion equation
   9,878.09 : 13,631.56 = 5,401.79 : x
2. Step 2: Convert to fraction form
   9,878.09/13,631.56 = 5,401.79/x
3. Step 3: Cross multiply
   9,878.09x = 13,631.56 × 5,401.79
4. Step 4: Simplify right side
   9,878.09x = 73,634,797.48
5. Step 5: Solve for x
   x = 73,634,797.48/9,878.09
6. Step 6: Final answer
   x = 7,454.36