Finding the Fourth Proportional to 38,870.07, 53,631.18 and 21,871

Step by Step Solution

1. Step 1: Write the proportion equation
   38,870.07 : 53,631.18 = 21,871 : x
2. Step 2: Convert to fraction form
   38,870.07/53,631.18 = 21,871/x
3. Step 3: Cross multiply
   38,870.07x = 53,631.18 × 21,871
4. Step 4: Simplify right side
   38,870.07x = 1,172,967,537.78
5. Step 5: Solve for x
   x = 1,172,967,537.78/38,870.07
6. Step 6: Final answer
   x = 30,176.63