Finding the Fourth Proportional to 21,915.72, 32,870.34 and 7,873.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,915.72 : 32,870.34 = 7,873.56 : x
2. Step 2: Convert to fraction form
   21,915.72/32,870.34 = 7,873.56/x
3. Step 3: Cross multiply
   21,915.72x = 32,870.34 × 7,873.56
4. Step 4: Simplify right side
   21,915.72x = 258,806,594.21
5. Step 5: Solve for x
   x = 258,806,594.21/21,915.72
6. Step 6: Final answer
   x = 11,809.18