Finding the Fourth Proportional to 31,150.05, 42,985.57 and 17,720.04

Step by Step Solution

1. Step 1: Write the proportion equation
   31,150.05 : 42,985.57 = 17,720.04 : x
2. Step 2: Convert to fraction form
   31,150.05/42,985.57 = 17,720.04/x
3. Step 3: Cross multiply
   31,150.05x = 42,985.57 × 17,720.04
4. Step 4: Simplify right side
   31,150.05x = 761,706,169.94
5. Step 5: Solve for x
   x = 761,706,169.94/31,150.05
6. Step 6: Final answer
   x = 24,452.81