Finding the Fourth Proportional to 31,072.16, 42,886.68 and 20,298.08

Step by Step Solution

1. Step 1: Write the proportion equation
   31,072.16 : 42,886.68 = 20,298.08 : x
2. Step 2: Convert to fraction form
   31,072.16/42,886.68 = 20,298.08/x
3. Step 3: Cross multiply
   31,072.16x = 42,886.68 × 20,298.08
4. Step 4: Simplify right side
   31,072.16x = 870,517,261.57
5. Step 5: Solve for x
   x = 870,517,261.57/31,072.16
6. Step 6: Final answer
   x = 28,015.99