Finding the Fourth Proportional to 8,478.28, 12,714.72 and 3,547

Step by Step Solution

1. Step 1: Write the proportion equation
   8,478.28 : 12,714.72 = 3,547 : x
2. Step 2: Convert to fraction form
   8,478.28/12,714.72 = 3,547/x
3. Step 3: Cross multiply
   8,478.28x = 12,714.72 × 3,547
4. Step 4: Simplify right side
   8,478.28x = 45,099,111.84
5. Step 5: Solve for x
   x = 45,099,111.84/8,478.28
6. Step 6: Final answer
   x = 5,319.37