Finding the Fourth Proportional to 9,039.78, 12,476.37 and 5,405.58

Step by Step Solution

1. Step 1: Write the proportion equation
   9,039.78 : 12,476.37 = 5,405.58 : x
2. Step 2: Convert to fraction form
   9,039.78/12,476.37 = 5,405.58/x
3. Step 3: Cross multiply
   9,039.78x = 12,476.37 × 5,405.58
4. Step 4: Simplify right side
   9,039.78x = 67,442,036.42
5. Step 5: Solve for x
   x = 67,442,036.42/9,039.78
6. Step 6: Final answer
   x = 7,460.58