Finding the Fourth Proportional to 30,759.59, 42,428.72 and 19,409.26

Step by Step Solution

1. Step 1: Write the proportion equation
   30,759.59 : 42,428.72 = 19,409.26 : x
2. Step 2: Convert to fraction form
   30,759.59/42,428.72 = 19,409.26/x
3. Step 3: Cross multiply
   30,759.59x = 42,428.72 × 19,409.26
4. Step 4: Simplify right side
   30,759.59x = 823,510,000.40
5. Step 5: Solve for x
   x = 823,510,000.40/30,759.59
6. Step 6: Final answer
   x = 26,772.47