Finding the Fourth Proportional to 30,879.72, 42,591.51 and 19,551.06

Step by Step Solution

1. Step 1: Write the proportion equation
   30,879.72 : 42,591.51 = 19,551.06 : x
2. Step 2: Convert to fraction form
   30,879.72/42,591.51 = 19,551.06/x
3. Step 3: Cross multiply
   30,879.72x = 42,591.51 × 19,551.06
4. Step 4: Simplify right side
   30,879.72x = 832,709,167.50
5. Step 5: Solve for x
   x = 832,709,167.50/30,879.72
6. Step 6: Final answer
   x = 26,966.21