Finding the Fourth Proportional to 28,686.69, 42,967.71 and 13,864.52

Step by Step Solution

1. Step 1: Write the proportion equation
   28,686.69 : 42,967.71 = 13,864.52 : x
2. Step 2: Convert to fraction form
   28,686.69/42,967.71 = 13,864.52/x
3. Step 3: Cross multiply
   28,686.69x = 42,967.71 × 13,864.52
4. Step 4: Simplify right side
   28,686.69x = 595,726,459.81
5. Step 5: Solve for x
   x = 595,726,459.81/28,686.69
6. Step 6: Final answer
   x = 20,766.65