Finding the Fourth Proportional to 10,987.40, 16,488.78 and 4,067.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,987.40 : 16,488.78 = 4,067.72 : x
2. Step 2: Convert to fraction form
   10,987.40/16,488.78 = 4,067.72/x
3. Step 3: Cross multiply
   10,987.40x = 16,488.78 × 4,067.72
4. Step 4: Simplify right side
   10,987.40x = 67,071,740.18
5. Step 5: Solve for x
   x = 67,071,740.18/10,987.40
6. Step 6: Final answer
   x = 6,104.42