Finding the Fourth Proportional to 105,574.42, 145,692.76 and 57,828.56

Step by Step Solution

1. Step 1: Write the proportion equation
   105,574.42 : 145,692.76 = 57,828.56 : x
2. Step 2: Convert to fraction form
   105,574.42/145,692.76 = 57,828.56/x
3. Step 3: Cross multiply
   105,574.42x = 145,692.76 × 57,828.56
4. Step 4: Simplify right side
   105,574.42x = 8,425,202,513.23
5. Step 5: Solve for x
   x = 8,425,202,513.23/105,574.42
6. Step 6: Final answer
   x = 79,803.45