Finding the Fourth Proportional to 9,878.05, 13,631.29 and 5,401.65

Step by Step Solution

1. Step 1: Write the proportion equation
   9,878.05 : 13,631.29 = 5,401.65 : x
2. Step 2: Convert to fraction form
   9,878.05/13,631.29 = 5,401.65/x
3. Step 3: Cross multiply
   9,878.05x = 13,631.29 × 5,401.65
4. Step 4: Simplify right side
   9,878.05x = 73,631,457.63
5. Step 5: Solve for x
   x = 73,631,457.63/9,878.05
6. Step 6: Final answer
   x = 7,454.05