Finding the Fourth Proportional to 9,179.06, 12,667.21 and 4,987.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,179.06 : 12,667.21 = 4,987.31 : x
2. Step 2: Convert to fraction form
   9,179.06/12,667.21 = 4,987.31/x
3. Step 3: Cross multiply
   9,179.06x = 12,667.21 × 4,987.31
4. Step 4: Simplify right side
   9,179.06x = 63,175,322.30
5. Step 5: Solve for x
   x = 63,175,322.30/9,179.06
6. Step 6: Final answer
   x = 6,882.55