Finding the Fourth Proportional to 30,713.64, 42,373.98 and 20,109.12

Step by Step Solution

1. Step 1: Write the proportion equation
   30,713.64 : 42,373.98 = 20,109.12 : x
2. Step 2: Convert to fraction form
   30,713.64/42,373.98 = 20,109.12/x
3. Step 3: Cross multiply
   30,713.64x = 42,373.98 × 20,109.12
4. Step 4: Simplify right side
   30,713.64x = 852,103,448.70
5. Step 5: Solve for x
   x = 852,103,448.70/30,713.64
6. Step 6: Final answer
   x = 27,743.49