Finding the Fourth Proportional to 76,408, 105,446.28 and 42,874

Step by Step Solution

1. Step 1: Write the proportion equation
   76,408 : 105,446.28 = 42,874 : x
2. Step 2: Convert to fraction form
   76,408/105,446.28 = 42,874/x
3. Step 3: Cross multiply
   76,408x = 105,446.28 × 42,874
4. Step 4: Simplify right side
   76,408x = 4,520,903,808.72
5. Step 5: Solve for x
   x = 4,520,903,808.72/76,408
6. Step 6: Final answer
   x = 59,167.94