Finding the Fourth Proportional to 21,429.93, 32,153.34 and 6,640.00

Step by Step Solution

1. Step 1: Write the proportion equation
   21,429.93 : 32,153.34 = 6,640.00 : x
2. Step 2: Convert to fraction form
   21,429.93/32,153.34 = 6,640.00/x
3. Step 3: Cross multiply
   21,429.93x = 32,153.34 × 6,640.00
4. Step 4: Simplify right side
   21,429.93x = 213,498,016.83
5. Step 5: Solve for x
   x = 213,498,016.83/21,429.93
6. Step 6: Final answer
   x = 9,962.61