Finding the Fourth Proportional to 30,669.33, 42,355.80 and 21,134.01

Step by Step Solution

1. Step 1: Write the proportion equation
   30,669.33 : 42,355.80 = 21,134.01 : x
2. Step 2: Convert to fraction form
   30,669.33/42,355.80 = 21,134.01/x
3. Step 3: Cross multiply
   30,669.33x = 42,355.80 × 21,134.01
4. Step 4: Simplify right side
   30,669.33x = 895,147,980.01
5. Step 5: Solve for x
   x = 895,147,980.01/30,669.33
6. Step 6: Final answer
   x = 29,187.07