Finding the Fourth Proportional to 18,959.74, 28,436.37 and 5,105.50

Step by Step Solution

1. Step 1: Write the proportion equation
   18,959.74 : 28,436.37 = 5,105.50 : x
2. Step 2: Convert to fraction form
   18,959.74/28,436.37 = 5,105.50/x
3. Step 3: Cross multiply
   18,959.74x = 28,436.37 × 5,105.50
4. Step 4: Simplify right side
   18,959.74x = 145,181,887.04
5. Step 5: Solve for x
   x = 145,181,887.04/18,959.74
6. Step 6: Final answer
   x = 7,657.38