Finding the Fourth Proportional to 30,647.59, 42,265.59 and 19,881.20

Step by Step Solution

1. Step 1: Write the proportion equation
   30,647.59 : 42,265.59 = 19,881.20 : x
2. Step 2: Convert to fraction form
   30,647.59/42,265.59 = 19,881.20/x
3. Step 3: Cross multiply
   30,647.59x = 42,265.59 × 19,881.20
4. Step 4: Simplify right side
   30,647.59x = 840,290,647.91
5. Step 5: Solve for x
   x = 840,290,647.91/30,647.59
6. Step 6: Final answer
   x = 27,417.84