Finding the Fourth Proportional to 10,535.16, 15,685.73 and 10,388.03

Step by Step Solution

1. Step 1: Write the proportion equation
   10,535.16 : 15,685.73 = 10,388.03 : x
2. Step 2: Convert to fraction form
   10,535.16/15,685.73 = 10,388.03/x
3. Step 3: Cross multiply
   10,535.16x = 15,685.73 × 10,388.03
4. Step 4: Simplify right side
   10,535.16x = 162,943,833.81
5. Step 5: Solve for x
   x = 162,943,833.81/10,535.16
6. Step 6: Final answer
   x = 15,466.67