Finding the Fourth Proportional to 28,118.52, 42,089.94 and 18,766.20

Step by Step Solution

1. Step 1: Write the proportion equation
   28,118.52 : 42,089.94 = 18,766.20 : x
2. Step 2: Convert to fraction form
   28,118.52/42,089.94 = 18,766.20/x
3. Step 3: Cross multiply
   28,118.52x = 42,089.94 × 18,766.20
4. Step 4: Simplify right side
   28,118.52x = 789,868,232.03
5. Step 5: Solve for x
   x = 789,868,232.03/28,118.52
6. Step 6: Final answer
   x = 28,090.68