Finding the Fourth Proportional to 21,528.32, 32,300.78 and 7,489.80

Step by Step Solution

1. Step 1: Write the proportion equation
   21,528.32 : 32,300.78 = 7,489.80 : x
2. Step 2: Convert to fraction form
   21,528.32/32,300.78 = 7,489.80/x
3. Step 3: Cross multiply
   21,528.32x = 32,300.78 × 7,489.80
4. Step 4: Simplify right side
   21,528.32x = 241,926,382.04
5. Step 5: Solve for x
   x = 241,926,382.04/21,528.32
6. Step 6: Final answer
   x = 11,237.59