Finding the Fourth Proportional to 18,953.71, 26,155.83 and 10,997.31

Step by Step Solution

1. Step 1: Write the proportion equation
   18,953.71 : 26,155.83 = 10,997.31 : x
2. Step 2: Convert to fraction form
   18,953.71/26,155.83 = 10,997.31/x
3. Step 3: Cross multiply
   18,953.71x = 26,155.83 × 10,997.31
4. Step 4: Simplify right side
   18,953.71x = 287,643,770.82
5. Step 5: Solve for x
   x = 287,643,770.82/18,953.71
6. Step 6: Final answer
   x = 15,176.12