Finding the Fourth Proportional to 30,885, 42,625.88 and 19,555.55

Step by Step Solution

1. Step 1: Write the proportion equation
   30,885 : 42,625.88 = 19,555.55 : x
2. Step 2: Convert to fraction form
   30,885/42,625.88 = 19,555.55/x
3. Step 3: Cross multiply
   30,885x = 42,625.88 × 19,555.55
4. Step 4: Simplify right side
   30,885x = 833,572,376.57
5. Step 5: Solve for x
   x = 833,572,376.57/30,885
6. Step 6: Final answer
   x = 26,989.55