Finding the Fourth Proportional to 11,945.02, 17,919.69 and 4,921.20

Step by Step Solution

1. Step 1: Write the proportion equation
   11,945.02 : 17,919.69 = 4,921.20 : x
2. Step 2: Convert to fraction form
   11,945.02/17,919.69 = 4,921.20/x
3. Step 3: Cross multiply
   11,945.02x = 17,919.69 × 4,921.20
4. Step 4: Simplify right side
   11,945.02x = 88,186,378.43
5. Step 5: Solve for x
   x = 88,186,378.43/11,945.02
6. Step 6: Final answer
   x = 7,382.69