Finding the Fourth Proportional to 21,990.55, 32,978.99 and 7,196.18

Step by Step Solution

1. Step 1: Write the proportion equation
   21,990.55 : 32,978.99 = 7,196.18 : x
2. Step 2: Convert to fraction form
   21,990.55/32,978.99 = 7,196.18/x
3. Step 3: Cross multiply
   21,990.55x = 32,978.99 × 7,196.18
4. Step 4: Simplify right side
   21,990.55x = 237,322,748.26
5. Step 5: Solve for x
   x = 237,322,748.26/21,990.55
6. Step 6: Final answer
   x = 10,792.03