Finding the Fourth Proportional to 105,523.05, 145,621.86 and 57,776.37

Step by Step Solution

1. Step 1: Write the proportion equation
   105,523.05 : 145,621.86 = 57,776.37 : x
2. Step 2: Convert to fraction form
   105,523.05/145,621.86 = 57,776.37/x
3. Step 3: Cross multiply
   105,523.05x = 145,621.86 × 57,776.37
4. Step 4: Simplify right side
   105,523.05x = 8,413,502,463.45
5. Step 5: Solve for x
   x = 8,413,502,463.45/105,523.05
6. Step 6: Final answer
   x = 79,731.42