Finding the Fourth Proportional to 9,070.35, 12,519.70 and 5,485.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,070.35 : 12,519.70 = 5,485.31 : x
2. Step 2: Convert to fraction form
   9,070.35/12,519.70 = 5,485.31/x
3. Step 3: Cross multiply
   9,070.35x = 12,519.70 × 5,485.31
4. Step 4: Simplify right side
   9,070.35x = 68,674,435.61
5. Step 5: Solve for x
   x = 68,674,435.61/9,070.35
6. Step 6: Final answer
   x = 7,571.31