Finding the Fourth Proportional to 28,436.79, 42,567.69 and 18,554.79

Step by Step Solution

1. Step 1: Write the proportion equation
   28,436.79 : 42,567.69 = 18,554.79 : x
2. Step 2: Convert to fraction form
   28,436.79/42,567.69 = 18,554.79/x
3. Step 3: Cross multiply
   28,436.79x = 42,567.69 × 18,554.79
4. Step 4: Simplify right side
   28,436.79x = 789,834,548.74
5. Step 5: Solve for x
   x = 789,834,548.74/28,436.79
6. Step 6: Final answer
   x = 27,775.10