Finding the Fourth Proportional to 9,118.90, 12,582.65 and 5,139.37

Step by Step Solution

1. Step 1: Write the proportion equation
   9,118.90 : 12,582.65 = 5,139.37 : x
2. Step 2: Convert to fraction form
   9,118.90/12,582.65 = 5,139.37/x
3. Step 3: Cross multiply
   9,118.90x = 12,582.65 × 5,139.37
4. Step 4: Simplify right side
   9,118.90x = 64,666,922.51
5. Step 5: Solve for x
   x = 64,666,922.51/9,118.90
6. Step 6: Final answer
   x = 7,091.53