Finding the Fourth Proportional to 28,111.10, 42,169.05 and 9,643.10

Step by Step Solution

1. Step 1: Write the proportion equation
   28,111.10 : 42,169.05 = 9,643.10 : x
2. Step 2: Convert to fraction form
   28,111.10/42,169.05 = 9,643.10/x
3. Step 3: Cross multiply
   28,111.10x = 42,169.05 × 9,643.10
4. Step 4: Simplify right side
   28,111.10x = 406,640,366.06
5. Step 5: Solve for x
   x = 406,640,366.06/28,111.10
6. Step 6: Final answer
   x = 14,465.47