Finding the Fourth Proportional to 76,647.31, 105,778.26 and 42,655.69

Step by Step Solution

1. Step 1: Write the proportion equation
   76,647.31 : 105,778.26 = 42,655.69 : x
2. Step 2: Convert to fraction form
   76,647.31/105,778.26 = 42,655.69/x
3. Step 3: Cross multiply
   76,647.31x = 105,778.26 × 42,655.69
4. Step 4: Simplify right side
   76,647.31x = 4,512,044,667.30
5. Step 5: Solve for x
   x = 4,512,044,667.30/76,647.31
6. Step 6: Final answer
   x = 58,867.62