Finding the Fourth Proportional to 28,084.16, 42,038.56 and 20,696.96

Step by Step Solution

1. Step 1: Write the proportion equation
   28,084.16 : 42,038.56 = 20,696.96 : x
2. Step 2: Convert to fraction form
   28,084.16/42,038.56 = 20,696.96/x
3. Step 3: Cross multiply
   28,084.16x = 42,038.56 × 20,696.96
4. Step 4: Simplify right side
   28,084.16x = 870,070,394.78
5. Step 5: Solve for x
   x = 870,070,394.78/28,084.16
6. Step 6: Final answer
   x = 30,980.82