Finding the Fourth Proportional to 11,917.24, 17,870.30 and 4,420.50

Step by Step Solution

1. Step 1: Write the proportion equation
   11,917.24 : 17,870.30 = 4,420.50 : x
2. Step 2: Convert to fraction form
   11,917.24/17,870.30 = 4,420.50/x
3. Step 3: Cross multiply
   11,917.24x = 17,870.30 × 4,420.50
4. Step 4: Simplify right side
   11,917.24x = 78,995,661.15
5. Step 5: Solve for x
   x = 78,995,661.15/11,917.24
6. Step 6: Final answer
   x = 6,628.69