Finding the Fourth Proportional to 105,556.14, 145,668.71 and 57,811.50

Step by Step Solution

1. Step 1: Write the proportion equation
   105,556.14 : 145,668.71 = 57,811.50 : x
2. Step 2: Convert to fraction form
   105,556.14/145,668.71 = 57,811.50/x
3. Step 3: Cross multiply
   105,556.14x = 145,668.71 × 57,811.50
4. Step 4: Simplify right side
   105,556.14x = 8,421,326,772.69
5. Step 5: Solve for x
   x = 8,421,326,772.69/105,556.14
6. Step 6: Final answer
   x = 79,780.55