Finding the Fourth Proportional to 21,899.72, 32,842.61 and 7,105.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,899.72 : 32,842.61 = 7,105.12 : x
2. Step 2: Convert to fraction form
   21,899.72/32,842.61 = 7,105.12/x
3. Step 3: Cross multiply
   21,899.72x = 32,842.61 × 7,105.12
4. Step 4: Simplify right side
   21,899.72x = 233,350,634.14
5. Step 5: Solve for x
   x = 233,350,634.14/21,899.72
6. Step 6: Final answer
   x = 10,655.42