Finding the Fourth Proportional to 9,170.38, 12,655.02 and 4,978.63

Step by Step Solution

1. Step 1: Write the proportion equation
   9,170.38 : 12,655.02 = 4,978.63 : x
2. Step 2: Convert to fraction form
   9,170.38/12,655.02 = 4,978.63/x
3. Step 3: Cross multiply
   9,170.38x = 12,655.02 × 4,978.63
4. Step 4: Simplify right side
   9,170.38x = 63,004,649.25
5. Step 5: Solve for x
   x = 63,004,649.25/9,170.38
6. Step 6: Final answer
   x = 6,870.45