Finding the Fourth Proportional to 31,041.12, 42,834.24 and 21,630

Step by Step Solution

1. Step 1: Write the proportion equation
   31,041.12 : 42,834.24 = 21,630 : x
2. Step 2: Convert to fraction form
   31,041.12/42,834.24 = 21,630/x
3. Step 3: Cross multiply
   31,041.12x = 42,834.24 × 21,630
4. Step 4: Simplify right side
   31,041.12x = 926,504,611.20
5. Step 5: Solve for x
   x = 926,504,611.20/31,041.12
6. Step 6: Final answer
   x = 29,847.65