Finding the Fourth Proportional to 28,568.76, 42,689.35 and 21,776.76

Step by Step Solution

1. Step 1: Write the proportion equation
   28,568.76 : 42,689.35 = 21,776.76 : x
2. Step 2: Convert to fraction form
   28,568.76/42,689.35 = 21,776.76/x
3. Step 3: Cross multiply
   28,568.76x = 42,689.35 × 21,776.76
4. Step 4: Simplify right side
   28,568.76x = 929,635,729.51
5. Step 5: Solve for x
   x = 929,635,729.51/28,568.76
6. Step 6: Final answer
   x = 32,540.29