Finding the Fourth Proportional to 7,955.50, 10,978.59 and 5,161

Step by Step Solution

1. Step 1: Write the proportion equation
   7,955.50 : 10,978.59 = 5,161 : x
2. Step 2: Convert to fraction form
   7,955.50/10,978.59 = 5,161/x
3. Step 3: Cross multiply
   7,955.50x = 10,978.59 × 5,161
4. Step 4: Simplify right side
   7,955.50x = 56,660,502.99
5. Step 5: Solve for x
   x = 56,660,502.99/7,955.50
6. Step 6: Final answer
   x = 7,122.18