Finding the Fourth Proportional to 76,660.42, 105,790.17 and 42,668.50

Step by Step Solution

1. Step 1: Write the proportion equation
   76,660.42 : 105,790.17 = 42,668.50 : x
2. Step 2: Convert to fraction form
   76,660.42/105,790.17 = 42,668.50/x
3. Step 3: Cross multiply
   76,660.42x = 105,790.17 × 42,668.50
4. Step 4: Simplify right side
   76,660.42x = 4,513,907,868.65
5. Step 5: Solve for x
   x = 4,513,907,868.65/76,660.42
6. Step 6: Final answer
   x = 58,881.86