Finding the Fourth Proportional to 9,170.42, 12,655.24 and 4,978.67

Step by Step Solution

1. Step 1: Write the proportion equation
   9,170.42 : 12,655.24 = 4,978.67 : x
2. Step 2: Convert to fraction form
   9,170.42/12,655.24 = 4,978.67/x
3. Step 3: Cross multiply
   9,170.42x = 12,655.24 × 4,978.67
4. Step 4: Simplify right side
   9,170.42x = 63,006,188.01
5. Step 5: Solve for x
   x = 63,006,188.01/9,170.42
6. Step 6: Final answer
   x = 6,870.59