Finding the Fourth Proportional to 72,978.75, 109,326.51 and 47,942.82

Step by Step Solution

1. Step 1: Write the proportion equation
   72,978.75 : 109,326.51 = 47,942.82 : x
2. Step 2: Convert to fraction form
   72,978.75/109,326.51 = 47,942.82/x
3. Step 3: Cross multiply
   72,978.75x = 109,326.51 × 47,942.82
4. Step 4: Simplify right side
   72,978.75x = 5,241,421,190.16
5. Step 5: Solve for x
   x = 5,241,421,190.16/72,978.75
6. Step 6: Final answer
   x = 71,821.20