Finding the Fourth Proportional to 30,715.24, 42,386.56 and 17,977.20

Step by Step Solution

1. Step 1: Write the proportion equation
   30,715.24 : 42,386.56 = 17,977.20 : x
2. Step 2: Convert to fraction form
   30,715.24/42,386.56 = 17,977.20/x
3. Step 3: Cross multiply
   30,715.24x = 42,386.56 × 17,977.20
4. Step 4: Simplify right side
   30,715.24x = 761,991,666.43
5. Step 5: Solve for x
   x = 761,991,666.43/30,715.24
6. Step 6: Final answer
   x = 24,808.26