Finding the Fourth Proportional to 30,565, 42,166.33 and 21,620.17

Step by Step Solution

1. Step 1: Write the proportion equation
   30,565 : 42,166.33 = 21,620.17 : x
2. Step 2: Convert to fraction form
   30,565/42,166.33 = 21,620.17/x
3. Step 3: Cross multiply
   30,565x = 42,166.33 × 21,620.17
4. Step 4: Simplify right side
   30,565x = 911,643,222.88
5. Step 5: Solve for x
   x = 911,643,222.88/30,565
6. Step 6: Final answer
   x = 29,826.38