Finding the Fourth Proportional to 28,419.50, 42,630.06 and 7,643

Step by Step Solution

1. Step 1: Write the proportion equation
   28,419.50 : 42,630.06 = 7,643 : x
2. Step 2: Convert to fraction form
   28,419.50/42,630.06 = 7,643/x
3. Step 3: Cross multiply
   28,419.50x = 42,630.06 × 7,643
4. Step 4: Simplify right side
   28,419.50x = 325,821,548.58
5. Step 5: Solve for x
   x = 325,821,548.58/28,419.50
6. Step 6: Final answer
   x = 11,464.72