Finding the Fourth Proportional to 30,931.45, 42,683.05 and 18,185.15

Step by Step Solution

1. Step 1: Write the proportion equation
   30,931.45 : 42,683.05 = 18,185.15 : x
2. Step 2: Convert to fraction form
   30,931.45/42,683.05 = 18,185.15/x
3. Step 3: Cross multiply
   30,931.45x = 42,683.05 × 18,185.15
4. Step 4: Simplify right side
   30,931.45x = 776,197,796.15
5. Step 5: Solve for x
   x = 776,197,796.15/30,931.45
6. Step 6: Final answer
   x = 25,094.13