Finding the Fourth Proportional to 105,780, 145,908 and 73,937.28

Step by Step Solution

1. Step 1: Write the proportion equation
   105,780 : 145,908 = 73,937.28 : x
2. Step 2: Convert to fraction form
   105,780/145,908 = 73,937.28/x
3. Step 3: Cross multiply
   105,780x = 145,908 × 73,937.28
4. Step 4: Simplify right side
   105,780x = 10,788,040,650.24
5. Step 5: Solve for x
   x = 10,788,040,650.24/105,780
6. Step 6: Final answer
   x = 101,985.64