Finding the Fourth Proportional to 9,118.84, 12,584.35 and 5,139.87

Step by Step Solution

1. Step 1: Write the proportion equation
   9,118.84 : 12,584.35 = 5,139.87 : x
2. Step 2: Convert to fraction form
   9,118.84/12,584.35 = 5,139.87/x
3. Step 3: Cross multiply
   9,118.84x = 12,584.35 × 5,139.87
4. Step 4: Simplify right side
   9,118.84x = 64,681,892.74
5. Step 5: Solve for x
   x = 64,681,892.74/9,118.84
6. Step 6: Final answer
   x = 7,093.21