Finding the Fourth Proportional to 21,828.98, 32,743.62 and 9,980.30

Step by Step Solution

1. Step 1: Write the proportion equation
   21,828.98 : 32,743.62 = 9,980.30 : x
2. Step 2: Convert to fraction form
   21,828.98/32,743.62 = 9,980.30/x
3. Step 3: Cross multiply
   21,828.98x = 32,743.62 × 9,980.30
4. Step 4: Simplify right side
   21,828.98x = 326,791,150.69
5. Step 5: Solve for x
   x = 326,791,150.69/21,828.98
6. Step 6: Final answer
   x = 14,970.52