Finding the Fourth Proportional to 31,105.08, 42,891.14 and 21,016.04

Step by Step Solution

1. Step 1: Write the proportion equation
   31,105.08 : 42,891.14 = 21,016.04 : x
2. Step 2: Convert to fraction form
   31,105.08/42,891.14 = 21,016.04/x
3. Step 3: Cross multiply
   31,105.08x = 42,891.14 × 21,016.04
4. Step 4: Simplify right side
   31,105.08x = 901,401,913.89
5. Step 5: Solve for x
   x = 901,401,913.89/31,105.08
6. Step 6: Final answer
   x = 28,979.25