Finding the Fourth Proportional to 76,397.76, 105,428.53 and 42,406.65

Step by Step Solution

1. Step 1: Write the proportion equation
   76,397.76 : 105,428.53 = 42,406.65 : x
2. Step 2: Convert to fraction form
   76,397.76/105,428.53 = 42,406.65/x
3. Step 3: Cross multiply
   76,397.76x = 105,428.53 × 42,406.65
4. Step 4: Simplify right side
   76,397.76x = 4,470,870,771.72
5. Step 5: Solve for x
   x = 4,470,870,771.72/76,397.76
6. Step 6: Final answer
   x = 58,520.97