Finding the Fourth Proportional to 28,522.30, 42,790.74 and 10,987.42

Step by Step Solution

1. Step 1: Write the proportion equation
   28,522.30 : 42,790.74 = 10,987.42 : x
2. Step 2: Convert to fraction form
   28,522.30/42,790.74 = 10,987.42/x
3. Step 3: Cross multiply
   28,522.30x = 42,790.74 × 10,987.42
4. Step 4: Simplify right side
   28,522.30x = 470,159,832.49
5. Step 5: Solve for x
   x = 470,159,832.49/28,522.30
6. Step 6: Final answer
   x = 16,483.94