Finding the Fourth Proportional to 9,018.39, 12,445.34 and 5,039.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,018.39 : 12,445.34 = 5,039.31 : x
2. Step 2: Convert to fraction form
   9,018.39/12,445.34 = 5,039.31/x
3. Step 3: Cross multiply
   9,018.39x = 12,445.34 × 5,039.31
4. Step 4: Simplify right side
   9,018.39x = 62,715,901.12
5. Step 5: Solve for x
   x = 62,715,901.12/9,018.39
6. Step 6: Final answer
   x = 6,954.22