Finding the Fourth Proportional to 10,695.51, 16,138.91 and 10,290.51

Step by Step Solution

1. Step 1: Write the proportion equation
   10,695.51 : 16,138.91 = 10,290.51 : x
2. Step 2: Convert to fraction form
   10,695.51/16,138.91 = 10,290.51/x
3. Step 3: Cross multiply
   10,695.51x = 16,138.91 × 10,290.51
4. Step 4: Simplify right side
   10,695.51x = 166,077,640.47
5. Step 5: Solve for x
   x = 166,077,640.47/10,695.51
6. Step 6: Final answer
   x = 15,527.79