Finding the Fourth Proportional to 30,978.18, 42,742.56 and 22,022.40

Step by Step Solution

1. Step 1: Write the proportion equation
   30,978.18 : 42,742.56 = 22,022.40 : x
2. Step 2: Convert to fraction form
   30,978.18/42,742.56 = 22,022.40/x
3. Step 3: Cross multiply
   30,978.18x = 42,742.56 × 22,022.40
4. Step 4: Simplify right side
   30,978.18x = 941,293,753.34
5. Step 5: Solve for x
   x = 941,293,753.34/30,978.18
6. Step 6: Final answer
   x = 30,385.70