Finding the Fourth Proportional to 8,917.35, 12,302.98 and 5,139.17

Step by Step Solution

1. Step 1: Write the proportion equation
   8,917.35 : 12,302.98 = 5,139.17 : x
2. Step 2: Convert to fraction form
   8,917.35/12,302.98 = 5,139.17/x
3. Step 3: Cross multiply
   8,917.35x = 12,302.98 × 5,139.17
4. Step 4: Simplify right side
   8,917.35x = 63,227,105.73
5. Step 5: Solve for x
   x = 63,227,105.73/8,917.35
6. Step 6: Final answer
   x = 7,090.35