Finding the Fourth Proportional to 30,642.81, 42,282.48 and 17,211.50

Step by Step Solution

1. Step 1: Write the proportion equation
   30,642.81 : 42,282.48 = 17,211.50 : x
2. Step 2: Convert to fraction form
   30,642.81/42,282.48 = 17,211.50/x
3. Step 3: Cross multiply
   30,642.81x = 42,282.48 × 17,211.50
4. Step 4: Simplify right side
   30,642.81x = 727,744,748.88
5. Step 5: Solve for x
   x = 727,744,748.88/30,642.81
6. Step 6: Final answer
   x = 23,749.28