Finding the Fourth Proportional to 30,973.55, 42,750.30 and 20,364.17

Step by Step Solution

1. Step 1: Write the proportion equation
   30,973.55 : 42,750.30 = 20,364.17 : x
2. Step 2: Convert to fraction form
   30,973.55/42,750.30 = 20,364.17/x
3. Step 3: Cross multiply
   30,973.55x = 42,750.30 × 20,364.17
4. Step 4: Simplify right side
   30,973.55x = 870,574,061.18
5. Step 5: Solve for x
   x = 870,574,061.18/30,973.55
6. Step 6: Final answer
   x = 28,107.02