Finding the Fourth Proportional to 42,320.31, 63,488.49 and 17,021.76

Step by Step Solution

1. Step 1: Write the proportion equation
   42,320.31 : 63,488.49 = 17,021.76 : x
2. Step 2: Convert to fraction form
   42,320.31/63,488.49 = 17,021.76/x
3. Step 3: Cross multiply
   42,320.31x = 63,488.49 × 17,021.76
4. Step 4: Simplify right side
   42,320.31x = 1,080,685,522.10
5. Step 5: Solve for x
   x = 1,080,685,522.10/42,320.31
6. Step 6: Final answer
   x = 25,535.86