Finding the Fourth Proportional to 9,064.86, 12,509.31 and 5,085.90

Step by Step Solution

1. Step 1: Write the proportion equation
   9,064.86 : 12,509.31 = 5,085.90 : x
2. Step 2: Convert to fraction form
   9,064.86/12,509.31 = 5,085.90/x
3. Step 3: Cross multiply
   9,064.86x = 12,509.31 × 5,085.90
4. Step 4: Simplify right side
   9,064.86x = 63,621,099.73
5. Step 5: Solve for x
   x = 63,621,099.73/9,064.86
6. Step 6: Final answer
   x = 7,018.43