Finding the Fourth Proportional to 76,397, 105,416.63 and 42,405.75

Step by Step Solution

1. Step 1: Write the proportion equation
   76,397 : 105,416.63 = 42,405.75 : x
2. Step 2: Convert to fraction form
   76,397/105,416.63 = 42,405.75/x
3. Step 3: Cross multiply
   76,397x = 105,416.63 × 42,405.75
4. Step 4: Simplify right side
   76,397x = 4,470,270,518.51
5. Step 5: Solve for x
   x = 4,470,270,518.51/76,397
6. Step 6: Final answer
   x = 58,513.69