Finding the Fourth Proportional to 30,805.76, 42,510.18 and 17,376.21

Step by Step Solution

1. Step 1: Write the proportion equation
   30,805.76 : 42,510.18 = 17,376.21 : x
2. Step 2: Convert to fraction form
   30,805.76/42,510.18 = 17,376.21/x
3. Step 3: Cross multiply
   30,805.76x = 42,510.18 × 17,376.21
4. Step 4: Simplify right side
   30,805.76x = 738,665,814.82
5. Step 5: Solve for x
   x = 738,665,814.82/30,805.76
6. Step 6: Final answer
   x = 23,978.18