Finding the Fourth Proportional to 11,948.59, 16,488.72 and 6,643.31

Step by Step Solution

1. Step 1: Write the proportion equation
   11,948.59 : 16,488.72 = 6,643.31 : x
2. Step 2: Convert to fraction form
   11,948.59/16,488.72 = 6,643.31/x
3. Step 3: Cross multiply
   11,948.59x = 16,488.72 × 6,643.31
4. Step 4: Simplify right side
   11,948.59x = 109,539,645.25
5. Step 5: Solve for x
   x = 109,539,645.25/11,948.59
6. Step 6: Final answer
   x = 9,167.58