Finding the Fourth Proportional to 81,864.69, 122,817.45 and 28,557.42

Step by Step Solution

1. Step 1: Write the proportion equation
   81,864.69 : 122,817.45 = 28,557.42 : x
2. Step 2: Convert to fraction form
   81,864.69/122,817.45 = 28,557.42/x
3. Step 3: Cross multiply
   81,864.69x = 122,817.45 × 28,557.42
4. Step 4: Simplify right side
   81,864.69x = 3,507,349,502.98
5. Step 5: Solve for x
   x = 3,507,349,502.98/81,864.69
6. Step 6: Final answer
   x = 42,843.25