Finding the Fourth Proportional to 30,520.05, 42,112.80 and 17,091.87

Step by Step Solution

1. Step 1: Write the proportion equation
   30,520.05 : 42,112.80 = 17,091.87 : x
2. Step 2: Convert to fraction form
   30,520.05/42,112.80 = 17,091.87/x
3. Step 3: Cross multiply
   30,520.05x = 42,112.80 × 17,091.87
4. Step 4: Simplify right side
   30,520.05x = 719,786,502.94
5. Step 5: Solve for x
   x = 719,786,502.94/30,520.05
6. Step 6: Final answer
   x = 23,584.05