Finding the Fourth Proportional to 11,488.64, 17,222.55 and 7,980.30

Step by Step Solution

1. Step 1: Write the proportion equation
   11,488.64 : 17,222.55 = 7,980.30 : x
2. Step 2: Convert to fraction form
   11,488.64/17,222.55 = 7,980.30/x
3. Step 3: Cross multiply
   11,488.64x = 17,222.55 × 7,980.30
4. Step 4: Simplify right side
   11,488.64x = 137,441,115.77
5. Step 5: Solve for x
   x = 137,441,115.77/11,488.64
6. Step 6: Final answer
   x = 11,963.22