Finding the Fourth Proportional to 30,507.81, 42,100.79 and 17,079.09

Step by Step Solution

1. Step 1: Write the proportion equation
   30,507.81 : 42,100.79 = 17,079.09 : x
2. Step 2: Convert to fraction form
   30,507.81/42,100.79 = 17,079.09/x
3. Step 3: Cross multiply
   30,507.81x = 42,100.79 × 17,079.09
4. Step 4: Simplify right side
   30,507.81x = 719,043,096.09
5. Step 5: Solve for x
   x = 719,043,096.09/30,507.81
6. Step 6: Final answer
   x = 23,569.15