Finding the Fourth Proportional to 30,912.56, 42,656.76 and 18,335.12

Step by Step Solution

1. Step 1: Write the proportion equation
   30,912.56 : 42,656.76 = 18,335.12 : x
2. Step 2: Convert to fraction form
   30,912.56/42,656.76 = 18,335.12/x
3. Step 3: Cross multiply
   30,912.56x = 42,656.76 × 18,335.12
4. Step 4: Simplify right side
   30,912.56x = 782,116,813.41
5. Step 5: Solve for x
   x = 782,116,813.41/30,912.56
6. Step 6: Final answer
   x = 25,300.94