Finding the Fourth Proportional to 30,574.77, 42,193.10 and 18,638.10

Step by Step Solution

1. Step 1: Write the proportion equation
   30,574.77 : 42,193.10 = 18,638.10 : x
2. Step 2: Convert to fraction form
   30,574.77/42,193.10 = 18,638.10/x
3. Step 3: Cross multiply
   30,574.77x = 42,193.10 × 18,638.10
4. Step 4: Simplify right side
   30,574.77x = 786,399,263.71
5. Step 5: Solve for x
   x = 786,399,263.71/30,574.77
6. Step 6: Final answer
   x = 25,720.53