Finding the Fourth Proportional to 76,404, 105,440.76 and 42,870

Step by Step Solution

1. Step 1: Write the proportion equation
   76,404 : 105,440.76 = 42,870 : x
2. Step 2: Convert to fraction form
   76,404/105,440.76 = 42,870/x
3. Step 3: Cross multiply
   76,404x = 105,440.76 × 42,870
4. Step 4: Simplify right side
   76,404x = 4,520,245,381.20
5. Step 5: Solve for x
   x = 4,520,245,381.20/76,404
6. Step 6: Final answer
   x = 59,162.42