Finding the Fourth Proportional to 21,991.04, 32,992.69 and 7,200.90

Step by Step Solution

1. Step 1: Write the proportion equation
   21,991.04 : 32,992.69 = 7,200.90 : x
2. Step 2: Convert to fraction form
   21,991.04/32,992.69 = 7,200.90/x
3. Step 3: Cross multiply
   21,991.04x = 32,992.69 × 7,200.90
4. Step 4: Simplify right side
   21,991.04x = 237,577,061.42
5. Step 5: Solve for x
   x = 237,577,061.42/21,991.04
6. Step 6: Final answer
   x = 10,803.36