Finding the Fourth Proportional to 76,659.42, 105,788.79 and 42,667.50

Step by Step Solution

1. Step 1: Write the proportion equation
   76,659.42 : 105,788.79 = 42,667.50 : x
2. Step 2: Convert to fraction form
   76,659.42/105,788.79 = 42,667.50/x
3. Step 3: Cross multiply
   76,659.42x = 105,788.79 × 42,667.50
4. Step 4: Simplify right side
   76,659.42x = 4,513,743,197.33
5. Step 5: Solve for x
   x = 4,513,743,197.33/76,659.42
6. Step 6: Final answer
   x = 58,880.48