Finding the Fourth Proportional to 105,401.98, 145,451.64 and 57,654.30

Step by Step Solution

1. Step 1: Write the proportion equation
   105,401.98 : 145,451.64 = 57,654.30 : x
2. Step 2: Convert to fraction form
   105,401.98/145,451.64 = 57,654.30/x
3. Step 3: Cross multiply
   105,401.98x = 145,451.64 × 57,654.30
4. Step 4: Simplify right side
   105,401.98x = 8,385,912,488.05
5. Step 5: Solve for x
   x = 8,385,912,488.05/105,401.98
6. Step 6: Final answer
   x = 79,561.24