Finding the Fourth Proportional to 30,967.61, 42,735.06 and 16,820.55

Step by Step Solution

1. Step 1: Write the proportion equation
   30,967.61 : 42,735.06 = 16,820.55 : x
2. Step 2: Convert to fraction form
   30,967.61/42,735.06 = 16,820.55/x
3. Step 3: Cross multiply
   30,967.61x = 42,735.06 × 16,820.55
4. Step 4: Simplify right side
   30,967.61x = 718,827,213.48
5. Step 5: Solve for x
   x = 718,827,213.48/30,967.61
6. Step 6: Final answer
   x = 23,212.23