Finding the Fourth Proportional to 8,649.72, 12,987.54 and 8,347.32

Step by Step Solution

1. Step 1: Write the proportion equation
   8,649.72 : 12,987.54 = 8,347.32 : x
2. Step 2: Convert to fraction form
   8,649.72/12,987.54 = 8,347.32/x
3. Step 3: Cross multiply
   8,649.72x = 12,987.54 × 8,347.32
4. Step 4: Simplify right side
   8,649.72x = 108,411,152.39
5. Step 5: Solve for x
   x = 108,411,152.39/8,649.72
6. Step 6: Final answer
   x = 12,533.49