Finding the Fourth Proportional to 9,170.17, 12,654.89 and 4,978.42

Step by Step Solution

1. Step 1: Write the proportion equation
   9,170.17 : 12,654.89 = 4,978.42 : x
2. Step 2: Convert to fraction form
   9,170.17/12,654.89 = 4,978.42/x
3. Step 3: Cross multiply
   9,170.17x = 12,654.89 × 4,978.42
4. Step 4: Simplify right side
   9,170.17x = 63,001,357.47
5. Step 5: Solve for x
   x = 63,001,357.47/9,170.17
6. Step 6: Final answer
   x = 6,870.25