Finding the Fourth Proportional to 9,170.28, 12,655.17 and 4,978.53

Step by Step Solution

1. Step 1: Write the proportion equation
   9,170.28 : 12,655.17 = 4,978.53 : x
2. Step 2: Convert to fraction form
   9,170.28/12,655.17 = 4,978.53/x
3. Step 3: Cross multiply
   9,170.28x = 12,655.17 × 4,978.53
4. Step 4: Simplify right side
   9,170.28x = 63,004,143.50
5. Step 5: Solve for x
   x = 63,004,143.50/9,170.28
6. Step 6: Final answer
   x = 6,870.47