Finding the Fourth Proportional to 8,417.06, 12,611.63 and 5,120.18

Step by Step Solution

1. Step 1: Write the proportion equation
   8,417.06 : 12,611.63 = 5,120.18 : x
2. Step 2: Convert to fraction form
   8,417.06/12,611.63 = 5,120.18/x
3. Step 3: Cross multiply
   8,417.06x = 12,611.63 × 5,120.18
4. Step 4: Simplify right side
   8,417.06x = 64,573,815.69
5. Step 5: Solve for x
   x = 64,573,815.69/8,417.06
6. Step 6: Final answer
   x = 7,671.78