Finding the Fourth Proportional to 30,680.77, 42,338.73 and 20,070.18

Step by Step Solution

1. Step 1: Write the proportion equation
   30,680.77 : 42,338.73 = 20,070.18 : x
2. Step 2: Convert to fraction form
   30,680.77/42,338.73 = 20,070.18/x
3. Step 3: Cross multiply
   30,680.77x = 42,338.73 × 20,070.18
4. Step 4: Simplify right side
   30,680.77x = 849,745,770.55
5. Step 5: Solve for x
   x = 849,745,770.55/30,680.77
6. Step 6: Final answer
   x = 27,696.36