Finding the Fourth Proportional to 33,870.42, 46,710.72 and 21,921.30

Step by Step Solution

1. Step 1: Write the proportion equation
   33,870.42 : 46,710.72 = 21,921.30 : x
2. Step 2: Convert to fraction form
   33,870.42/46,710.72 = 21,921.30/x
3. Step 3: Cross multiply
   33,870.42x = 46,710.72 × 21,921.30
4. Step 4: Simplify right side
   33,870.42x = 1,023,959,706.34
5. Step 5: Solve for x
   x = 1,023,959,706.34/33,870.42
6. Step 6: Final answer
   x = 30,231.68