Finding the Fourth Proportional to 76,638.28, 105,757.02 and 42,648.76

Step by Step Solution

1. Step 1: Write the proportion equation
   76,638.28 : 105,757.02 = 42,648.76 : x
2. Step 2: Convert to fraction form
   76,638.28/105,757.02 = 42,648.76/x
3. Step 3: Cross multiply
   76,638.28x = 105,757.02 × 42,648.76
4. Step 4: Simplify right side
   76,638.28x = 4,510,405,764.30
5. Step 5: Solve for x
   x = 4,510,405,764.30/76,638.28
6. Step 6: Final answer
   x = 58,853.17