Finding the Fourth Proportional to 76,398.75, 105,425.40 and 42,407.91

Step by Step Solution

1. Step 1: Write the proportion equation
   76,398.75 : 105,425.40 = 42,407.91 : x
2. Step 2: Convert to fraction form
   76,398.75/105,425.40 = 42,407.91/x
3. Step 3: Cross multiply
   76,398.75x = 105,425.40 × 42,407.91
4. Step 4: Simplify right side
   76,398.75x = 4,470,870,874.91
5. Step 5: Solve for x
   x = 4,470,870,874.91/76,398.75
6. Step 6: Final answer
   x = 58,520.21