Finding the Fourth Proportional to 31,084.11, 42,881.31 and 21,016.01

Step by Step Solution

1. Step 1: Write the proportion equation
   31,084.11 : 42,881.31 = 21,016.01 : x
2. Step 2: Convert to fraction form
   31,084.11/42,881.31 = 21,016.01/x
3. Step 3: Cross multiply
   31,084.11x = 42,881.31 × 21,016.01
4. Step 4: Simplify right side
   31,084.11x = 901,193,825.37
5. Step 5: Solve for x
   x = 901,193,825.37/31,084.11
6. Step 6: Final answer
   x = 28,992.11