Finding the Fourth Proportional to 30,931.34, 42,685.34 and 18,994.55

Step by Step Solution

1. Step 1: Write the proportion equation
   30,931.34 : 42,685.34 = 18,994.55 : x
2. Step 2: Convert to fraction form
   30,931.34/42,685.34 = 18,994.55/x
3. Step 3: Cross multiply
   30,931.34x = 42,685.34 × 18,994.55
4. Step 4: Simplify right side
   30,931.34x = 810,788,516.50
5. Step 5: Solve for x
   x = 810,788,516.50/30,931.34
6. Step 6: Final answer
   x = 26,212.53