Finding the Fourth Proportional to 30,868, 42,607.56 and 19,690

Step by Step Solution

1. Step 1: Write the proportion equation
   30,868 : 42,607.56 = 19,690 : x
2. Step 2: Convert to fraction form
   30,868/42,607.56 = 19,690/x
3. Step 3: Cross multiply
   30,868x = 42,607.56 × 19,690
4. Step 4: Simplify right side
   30,868x = 838,942,856.40
5. Step 5: Solve for x
   x = 838,942,856.40/30,868
6. Step 6: Final answer
   x = 27,178.40