Finding the Fourth Proportional to 9,419.88, 12,999.18 and 5,170.94

Step by Step Solution

1. Step 1: Write the proportion equation
   9,419.88 : 12,999.18 = 5,170.94 : x
2. Step 2: Convert to fraction form
   9,419.88/12,999.18 = 5,170.94/x
3. Step 3: Cross multiply
   9,419.88x = 12,999.18 × 5,170.94
4. Step 4: Simplify right side
   9,419.88x = 67,217,914.83
5. Step 5: Solve for x
   x = 67,217,914.83/9,419.88
6. Step 6: Final answer
   x = 7,135.75