Finding the Fourth Proportional to 9,987.57, 14,976.72 and 5,828.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,987.57 : 14,976.72 = 5,828.78 : x
2. Step 2: Convert to fraction form
   9,987.57/14,976.72 = 5,828.78/x
3. Step 3: Cross multiply
   9,987.57x = 14,976.72 × 5,828.78
4. Step 4: Simplify right side
   9,987.57x = 87,295,931.12
5. Step 5: Solve for x
   x = 87,295,931.12/9,987.57
6. Step 6: Final answer
   x = 8,740.46