Finding the Fourth Proportional to 28,679.34, 42,987.96 and 12,048.42

Step by Step Solution

1. Step 1: Write the proportion equation
   28,679.34 : 42,987.96 = 12,048.42 : x
2. Step 2: Convert to fraction form
   28,679.34/42,987.96 = 12,048.42/x
3. Step 3: Cross multiply
   28,679.34x = 42,987.96 × 12,048.42
4. Step 4: Simplify right side
   28,679.34x = 517,936,997.02
5. Step 5: Solve for x
   x = 517,936,997.02/28,679.34
6. Step 6: Final answer
   x = 18,059.59