Finding the Fourth Proportional to 30,877, 42,619.98 and 19,699

Step by Step Solution

1. Step 1: Write the proportion equation
   30,877 : 42,619.98 = 19,699 : x
2. Step 2: Convert to fraction form
   30,877/42,619.98 = 19,699/x
3. Step 3: Cross multiply
   30,877x = 42,619.98 × 19,699
4. Step 4: Simplify right side
   30,877x = 839,570,986.02
5. Step 5: Solve for x
   x = 839,570,986.02/30,877
6. Step 6: Final answer
   x = 27,190.82