Finding the Fourth Proportional to 30,478.87, 42,020.53 and 21,973.87

Step by Step Solution

1. Step 1: Write the proportion equation
   30,478.87 : 42,020.53 = 21,973.87 : x
2. Step 2: Convert to fraction form
   30,478.87/42,020.53 = 21,973.87/x
3. Step 3: Cross multiply
   30,478.87x = 42,020.53 × 21,973.87
4. Step 4: Simplify right side
   30,478.87x = 923,353,663.55
5. Step 5: Solve for x
   x = 923,353,663.55/30,478.87
6. Step 6: Final answer
   x = 30,294.88