Finding the Fourth Proportional to 72,919.05, 109,384.76 and 20,328.59

Step by Step Solution

1. Step 1: Write the proportion equation
   72,919.05 : 109,384.76 = 20,328.59 : x
2. Step 2: Convert to fraction form
   72,919.05/109,384.76 = 20,328.59/x
3. Step 3: Cross multiply
   72,919.05x = 109,384.76 × 20,328.59
4. Step 4: Simplify right side
   72,919.05x = 2,223,637,563.18
5. Step 5: Solve for x
   x = 2,223,637,563.18/72,919.05
6. Step 6: Final answer
   x = 30,494.60