Finding the Fourth Proportional to 72,919.18, 109,384.94 and 20,328.71

Step by Step Solution

1. Step 1: Write the proportion equation
   72,919.18 : 109,384.94 = 20,328.71 : x
2. Step 2: Convert to fraction form
   72,919.18/109,384.94 = 20,328.71/x
3. Step 3: Cross multiply
   72,919.18x = 109,384.94 × 20,328.71
4. Step 4: Simplify right side
   72,919.18x = 2,223,655,047.91
5. Step 5: Solve for x
   x = 2,223,655,047.91/72,919.18
6. Step 6: Final answer
   x = 30,494.79