Finding the Fourth Proportional to 30,886.76, 42,628.31 and 19,557.31

Step by Step Solution

1. Step 1: Write the proportion equation
   30,886.76 : 42,628.31 = 19,557.31 : x
2. Step 2: Convert to fraction form
   30,886.76/42,628.31 = 19,557.31/x
3. Step 3: Cross multiply
   30,886.76x = 42,628.31 × 19,557.31
4. Step 4: Simplify right side
   30,886.76x = 833,694,869.09
5. Step 5: Solve for x
   x = 833,694,869.09/30,886.76
6. Step 6: Final answer
   x = 26,991.99