Finding the Fourth Proportional to 9,170, 12,654.87 and 4,978.52

Step by Step Solution

1. Step 1: Write the proportion equation
   9,170 : 12,654.87 = 4,978.52 : x
2. Step 2: Convert to fraction form
   9,170/12,654.87 = 4,978.52/x
3. Step 3: Cross multiply
   9,170x = 12,654.87 × 4,978.52
4. Step 4: Simplify right side
   9,170x = 63,002,523.39
5. Step 5: Solve for x
   x = 63,002,523.39/9,170
6. Step 6: Final answer
   x = 6,870.50