Finding the Fourth Proportional to 72,728.04, 109,142.28 and 47,780.04

Step by Step Solution

1. Step 1: Write the proportion equation
   72,728.04 : 109,142.28 = 47,780.04 : x
2. Step 2: Convert to fraction form
   72,728.04/109,142.28 = 47,780.04/x
3. Step 3: Cross multiply
   72,728.04x = 109,142.28 × 47,780.04
4. Step 4: Simplify right side
   72,728.04x = 5,214,822,504.09
5. Step 5: Solve for x
   x = 5,214,822,504.09/72,728.04
6. Step 6: Final answer
   x = 71,703.05