Finding the Fourth Proportional to 31,108, 42,914.24 and 21,039.96

Step by Step Solution

1. Step 1: Write the proportion equation
   31,108 : 42,914.24 = 21,039.96 : x
2. Step 2: Convert to fraction form
   31,108/42,914.24 = 21,039.96/x
3. Step 3: Cross multiply
   31,108x = 42,914.24 × 21,039.96
4. Step 4: Simplify right side
   31,108x = 902,913,893.03
5. Step 5: Solve for x
   x = 902,913,893.03/31,108
6. Step 6: Final answer
   x = 29,025.13