Finding the Fourth Proportional to 10,997.80, 16,471.16 and 10,915.84

Step by Step Solution

1. Step 1: Write the proportion equation
   10,997.80 : 16,471.16 = 10,915.84 : x
2. Step 2: Convert to fraction form
   10,997.80/16,471.16 = 10,915.84/x
3. Step 3: Cross multiply
   10,997.80x = 16,471.16 × 10,915.84
4. Step 4: Simplify right side
   10,997.80x = 179,796,547.17
5. Step 5: Solve for x
   x = 179,796,547.17/10,997.80
6. Step 6: Final answer
   x = 16,348.41