Finding the Fourth Proportional to 30,978.60, 42,754.10 and 18,403.34

Step by Step Solution

1. Step 1: Write the proportion equation
   30,978.60 : 42,754.10 = 18,403.34 : x
2. Step 2: Convert to fraction form
   30,978.60/42,754.10 = 18,403.34/x
3. Step 3: Cross multiply
   30,978.60x = 42,754.10 × 18,403.34
4. Step 4: Simplify right side
   30,978.60x = 786,818,238.69
5. Step 5: Solve for x
   x = 786,818,238.69/30,978.60
6. Step 6: Final answer
   x = 25,398.77