Finding the Fourth Proportional to 30,705.54, 42,373.71 and 18,131.10

Step by Step Solution

1. Step 1: Write the proportion equation
   30,705.54 : 42,373.71 = 18,131.10 : x
2. Step 2: Convert to fraction form
   30,705.54/42,373.71 = 18,131.10/x
3. Step 3: Cross multiply
   30,705.54x = 42,373.71 × 18,131.10
4. Step 4: Simplify right side
   30,705.54x = 768,281,973.38
5. Step 5: Solve for x
   x = 768,281,973.38/30,705.54
6. Step 6: Final answer
   x = 25,020.96