Finding the Fourth Proportional to 9,170.14, 12,654.59 and 4,978.39

Step by Step Solution

1. Step 1: Write the proportion equation
   9,170.14 : 12,654.59 = 4,978.39 : x
2. Step 2: Convert to fraction form
   9,170.14/12,654.59 = 4,978.39/x
3. Step 3: Cross multiply
   9,170.14x = 12,654.59 × 4,978.39
4. Step 4: Simplify right side
   9,170.14x = 62,999,421.04
5. Step 5: Solve for x
   x = 62,999,421.04/9,170.14
6. Step 6: Final answer
   x = 6,870.06