Finding the Fourth Proportional to 30,853.18, 42,577.20 and 17,428.78

Step by Step Solution

1. Step 1: Write the proportion equation
   30,853.18 : 42,577.20 = 17,428.78 : x
2. Step 2: Convert to fraction form
   30,853.18/42,577.20 = 17,428.78/x
3. Step 3: Cross multiply
   30,853.18x = 42,577.20 × 17,428.78
4. Step 4: Simplify right side
   30,853.18x = 742,068,651.82
5. Step 5: Solve for x
   x = 742,068,651.82/30,853.18
6. Step 6: Final answer
   x = 24,051.61