Finding the Fourth Proportional to 9,118.88, 12,583.74 and 5,139.76

Step by Step Solution

1. Step 1: Write the proportion equation
   9,118.88 : 12,583.74 = 5,139.76 : x
2. Step 2: Convert to fraction form
   9,118.88/12,583.74 = 5,139.76/x
3. Step 3: Cross multiply
   9,118.88x = 12,583.74 × 5,139.76
4. Step 4: Simplify right side
   9,118.88x = 64,677,403.50
5. Step 5: Solve for x
   x = 64,677,403.50/9,118.88
6. Step 6: Final answer
   x = 7,092.69