Finding the Fourth Proportional to 42,621.10, 63,971.04 and 21,575.91

Step by Step Solution

1. Step 1: Write the proportion equation
   42,621.10 : 63,971.04 = 21,575.91 : x
2. Step 2: Convert to fraction form
   42,621.10/63,971.04 = 21,575.91/x
3. Step 3: Cross multiply
   42,621.10x = 63,971.04 × 21,575.91
4. Step 4: Simplify right side
   42,621.10x = 1,380,233,401.65
5. Step 5: Solve for x
   x = 1,380,233,401.65/42,621.10
6. Step 6: Final answer
   x = 32,383.81