Finding the Fourth Proportional to 30,782.79, 42,658.72 and 30,192.21

Step by Step Solution

1. Step 1: Write the proportion equation
   30,782.79 : 42,658.72 = 30,192.21 : x
2. Step 2: Convert to fraction form
   30,782.79/42,658.72 = 30,192.21/x
3. Step 3: Cross multiply
   30,782.79x = 42,658.72 × 30,192.21
4. Step 4: Simplify right side
   30,782.79x = 1,287,960,957.09
5. Step 5: Solve for x
   x = 1,287,960,957.09/30,782.79
6. Step 6: Final answer
   x = 41,840.29