Finding the Fourth Proportional to 30,522.36, 42,129 and 28,663.68

Step by Step Solution

1. Step 1: Write the proportion equation
   30,522.36 : 42,129 = 28,663.68 : x
2. Step 2: Convert to fraction form
   30,522.36/42,129 = 28,663.68/x
3. Step 3: Cross multiply
   30,522.36x = 42,129 × 28,663.68
4. Step 4: Simplify right side
   30,522.36x = 1,207,572,174.72
5. Step 5: Solve for x
   x = 1,207,572,174.72/30,522.36
6. Step 6: Final answer
   x = 39,563.53