Finding the Fourth Proportional to 30,486.96, 42,069.24 and 19,308.72

Step by Step Solution

1. Step 1: Write the proportion equation
   30,486.96 : 42,069.24 = 19,308.72 : x
2. Step 2: Convert to fraction form
   30,486.96/42,069.24 = 19,308.72/x
3. Step 3: Cross multiply
   30,486.96x = 42,069.24 × 19,308.72
4. Step 4: Simplify right side
   30,486.96x = 812,303,175.77
5. Step 5: Solve for x
   x = 812,303,175.77/30,486.96
6. Step 6: Final answer
   x = 26,644.28