Finding the Fourth Proportional to 28,647.36, 42,987.72 and 12,006

Step by Step Solution

1. Step 1: Write the proportion equation
   28,647.36 : 42,987.72 = 12,006 : x
2. Step 2: Convert to fraction form
   28,647.36/42,987.72 = 12,006/x
3. Step 3: Cross multiply
   28,647.36x = 42,987.72 × 12,006
4. Step 4: Simplify right side
   28,647.36x = 516,110,566.32
5. Step 5: Solve for x
   x = 516,110,566.32/28,647.36
6. Step 6: Final answer
   x = 18,015.99