Finding the Fourth Proportional to 105,548.42, 145,655.42 and 57,801.80

Step by Step Solution

1. Step 1: Write the proportion equation
   105,548.42 : 145,655.42 = 57,801.80 : x
2. Step 2: Convert to fraction form
   105,548.42/145,655.42 = 57,801.80/x
3. Step 3: Cross multiply
   105,548.42x = 145,655.42 × 57,801.80
4. Step 4: Simplify right side
   105,548.42x = 8,419,145,530.89
5. Step 5: Solve for x
   x = 8,419,145,530.89/105,548.42
6. Step 6: Final answer
   x = 79,765.72