Finding the Fourth Proportional to 72,990.72, 109,529.28 and 30,868.43

Step by Step Solution

1. Step 1: Write the proportion equation
   72,990.72 : 109,529.28 = 30,868.43 : x
2. Step 2: Convert to fraction form
   72,990.72/109,529.28 = 30,868.43/x
3. Step 3: Cross multiply
   72,990.72x = 109,529.28 × 30,868.43
4. Step 4: Simplify right side
   72,990.72x = 3,380,996,364.98
5. Step 5: Solve for x
   x = 3,380,996,364.98/72,990.72
6. Step 6: Final answer
   x = 46,320.91