Finding the Fourth Proportional to 21,489.40, 29,654.22 and 12,061

Step by Step Solution

1. Step 1: Write the proportion equation
   21,489.40 : 29,654.22 = 12,061 : x
2. Step 2: Convert to fraction form
   21,489.40/29,654.22 = 12,061/x
3. Step 3: Cross multiply
   21,489.40x = 29,654.22 × 12,061
4. Step 4: Simplify right side
   21,489.40x = 357,659,547.42
5. Step 5: Solve for x
   x = 357,659,547.42/21,489.40
6. Step 6: Final answer
   x = 16,643.53