Finding the Fourth Proportional to 21,931.32, 32,820.42 and 17,936.40

Step by Step Solution

1. Step 1: Write the proportion equation
   21,931.32 : 32,820.42 = 17,936.40 : x
2. Step 2: Convert to fraction form
   21,931.32/32,820.42 = 17,936.40/x
3. Step 3: Cross multiply
   21,931.32x = 32,820.42 × 17,936.40
4. Step 4: Simplify right side
   21,931.32x = 588,680,181.29
5. Step 5: Solve for x
   x = 588,680,181.29/21,931.32
6. Step 6: Final answer
   x = 26,841.99