Finding the Fourth Proportional to 28,014.64, 42,007.34 and 8,290.52

Step by Step Solution

1. Step 1: Write the proportion equation
   28,014.64 : 42,007.34 = 8,290.52 : x
2. Step 2: Convert to fraction form
   28,014.64/42,007.34 = 8,290.52/x
3. Step 3: Cross multiply
   28,014.64x = 42,007.34 × 8,290.52
4. Step 4: Simplify right side
   28,014.64x = 348,262,692.42
5. Step 5: Solve for x
   x = 348,262,692.42/28,014.64
6. Step 6: Final answer
   x = 12,431.45