Finding the Fourth Proportional to 28,185.16, 42,279.34 and 10,653.48

Step by Step Solution

1. Step 1: Write the proportion equation
   28,185.16 : 42,279.34 = 10,653.48 : x
2. Step 2: Convert to fraction form
   28,185.16/42,279.34 = 10,653.48/x
3. Step 3: Cross multiply
   28,185.16x = 42,279.34 × 10,653.48
4. Step 4: Simplify right side
   28,185.16x = 450,422,103.10
5. Step 5: Solve for x
   x = 450,422,103.10/28,185.16
6. Step 6: Final answer
   x = 15,980.82