Finding the Fourth Proportional to 30,978.72, 42,752.88 and 18,232.56

Step by Step Solution

1. Step 1: Write the proportion equation
   30,978.72 : 42,752.88 = 18,232.56 : x
2. Step 2: Convert to fraction form
   30,978.72/42,752.88 = 18,232.56/x
3. Step 3: Cross multiply
   30,978.72x = 42,752.88 × 18,232.56
4. Step 4: Simplify right side
   30,978.72x = 779,494,449.77
5. Step 5: Solve for x
   x = 779,494,449.77/30,978.72
6. Step 6: Final answer
   x = 25,162.25