Finding the Fourth Proportional to 21,870.62, 32,776.88 and 8,715.76

Step by Step Solution

1. Step 1: Write the proportion equation
   21,870.62 : 32,776.88 = 8,715.76 : x
2. Step 2: Convert to fraction form
   21,870.62/32,776.88 = 8,715.76/x
3. Step 3: Cross multiply
   21,870.62x = 32,776.88 × 8,715.76
4. Step 4: Simplify right side
   21,870.62x = 285,675,419.63
5. Step 5: Solve for x
   x = 285,675,419.63/21,870.62
6. Step 6: Final answer
   x = 13,062.06