Finding the Fourth Proportional to 30,978, 42,742.80 and 17,548.08

Step by Step Solution

1. Step 1: Write the proportion equation
   30,978 : 42,742.80 = 17,548.08 : x
2. Step 2: Convert to fraction form
   30,978/42,742.80 = 17,548.08/x
3. Step 3: Cross multiply
   30,978x = 42,742.80 × 17,548.08
4. Step 4: Simplify right side
   30,978x = 750,054,073.82
5. Step 5: Solve for x
   x = 750,054,073.82/30,978
6. Step 6: Final answer
   x = 24,212.48