Finding the Fourth Proportional to 22,381, 30,878.22 and 12,946.12

Step by Step Solution

1. Step 1: Write the proportion equation
   22,381 : 30,878.22 = 12,946.12 : x
2. Step 2: Convert to fraction form
   22,381/30,878.22 = 12,946.12/x
3. Step 3: Cross multiply
   22,381x = 30,878.22 × 12,946.12
4. Step 4: Simplify right side
   22,381x = 399,753,141.51
5. Step 5: Solve for x
   x = 399,753,141.51/22,381
6. Step 6: Final answer
   x = 17,861.27