Finding the Fourth Proportional to 31,018.84, 42,802.67 and 18,271.02

Step by Step Solution

1. Step 1: Write the proportion equation
   31,018.84 : 42,802.67 = 18,271.02 : x
2. Step 2: Convert to fraction form
   31,018.84/42,802.67 = 18,271.02/x
3. Step 3: Cross multiply
   31,018.84x = 42,802.67 × 18,271.02
4. Step 4: Simplify right side
   31,018.84x = 782,048,276.58
5. Step 5: Solve for x
   x = 782,048,276.58/31,018.84
6. Step 6: Final answer
   x = 25,212.04