Finding the Fourth Proportional to 9,170.53, 12,655.23 and 4,978.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,170.53 : 12,655.23 = 4,978.78 : x
2. Step 2: Convert to fraction form
   9,170.53/12,655.23 = 4,978.78/x
3. Step 3: Cross multiply
   9,170.53x = 12,655.23 × 4,978.78
4. Step 4: Simplify right side
   9,170.53x = 63,007,606.02
5. Step 5: Solve for x
   x = 63,007,606.02/9,170.53
6. Step 6: Final answer
   x = 6,870.66