Finding the Fourth Proportional to 31,038.12, 42,802.83 and 20,852.17

Step by Step Solution

1. Step 1: Write the proportion equation
   31,038.12 : 42,802.83 = 20,852.17 : x
2. Step 2: Convert to fraction form
   31,038.12/42,802.83 = 20,852.17/x
3. Step 3: Cross multiply
   31,038.12x = 42,802.83 × 20,852.17
4. Step 4: Simplify right side
   31,038.12x = 892,531,780.63
5. Step 5: Solve for x
   x = 892,531,780.63/31,038.12
6. Step 6: Final answer
   x = 28,755.99