Finding the Fourth Proportional to 30,740.31, 42,398.91 and 21,183.39

Step by Step Solution

1. Step 1: Write the proportion equation
   30,740.31 : 42,398.91 = 21,183.39 : x
2. Step 2: Convert to fraction form
   30,740.31/42,398.91 = 21,183.39/x
3. Step 3: Cross multiply
   30,740.31x = 42,398.91 × 21,183.39
4. Step 4: Simplify right side
   30,740.31x = 898,152,646.10
5. Step 5: Solve for x
   x = 898,152,646.10/30,740.31
6. Step 6: Final answer
   x = 29,217.42