Finding the Fourth Proportional to 30,780.89, 42,478.01 and 17,352.15

Step by Step Solution

1. Step 1: Write the proportion equation
   30,780.89 : 42,478.01 = 17,352.15 : x
2. Step 2: Convert to fraction form
   30,780.89/42,478.01 = 17,352.15/x
3. Step 3: Cross multiply
   30,780.89x = 42,478.01 × 17,352.15
4. Step 4: Simplify right side
   30,780.89x = 737,084,801.22
5. Step 5: Solve for x
   x = 737,084,801.22/30,780.89
6. Step 6: Final answer
   x = 23,946.18