Finding the Fourth Proportional to 31,013.08, 42,802.13 and 30,168.69

Step by Step Solution

1. Step 1: Write the proportion equation
   31,013.08 : 42,802.13 = 30,168.69 : x
2. Step 2: Convert to fraction form
   31,013.08/42,802.13 = 30,168.69/x
3. Step 3: Cross multiply
   31,013.08x = 42,802.13 × 30,168.69
4. Step 4: Simplify right side
   31,013.08x = 1,291,284,040.47
5. Step 5: Solve for x
   x = 1,291,284,040.47/31,013.08
6. Step 6: Final answer
   x = 41,636.76