Finding the Fourth Proportional to 10,638.10, 15,931.41 and 9,069.13

Step by Step Solution

1. Step 1: Write the proportion equation
   10,638.10 : 15,931.41 = 9,069.13 : x
2. Step 2: Convert to fraction form
   10,638.10/15,931.41 = 9,069.13/x
3. Step 3: Cross multiply
   10,638.10x = 15,931.41 × 9,069.13
4. Step 4: Simplify right side
   10,638.10x = 144,484,028.37
5. Step 5: Solve for x
   x = 144,484,028.37/10,638.10
6. Step 6: Final answer
   x = 13,581.75