Finding the Fourth Proportional to 14,128.53, 21,196.26 and 9,976.65

Step by Step Solution

1. Step 1: Write the proportion equation
   14,128.53 : 21,196.26 = 9,976.65 : x
2. Step 2: Convert to fraction form
   14,128.53/21,196.26 = 9,976.65/x
3. Step 3: Cross multiply
   14,128.53x = 21,196.26 × 9,976.65
4. Step 4: Simplify right side
   14,128.53x = 211,467,667.33
5. Step 5: Solve for x
   x = 211,467,667.33/14,128.53
6. Step 6: Final answer
   x = 14,967.42