Finding the Fourth Proportional to 21,590.72, 32,386.88 and 7,739.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,590.72 : 32,386.88 = 7,739.72 : x
2. Step 2: Convert to fraction form
   21,590.72/32,386.88 = 7,739.72/x
3. Step 3: Cross multiply
   21,590.72x = 32,386.88 × 7,739.72
4. Step 4: Simplify right side
   21,590.72x = 250,665,382.87
5. Step 5: Solve for x
   x = 250,665,382.87/21,590.72
6. Step 6: Final answer
   x = 11,609.87