Finding the Fourth Proportional to 76,397.30, 105,423.36 and 42,405.81

Step by Step Solution

1. Step 1: Write the proportion equation
   76,397.30 : 105,423.36 = 42,405.81 : x
2. Step 2: Convert to fraction form
   76,397.30/105,423.36 = 42,405.81/x
3. Step 3: Cross multiply
   76,397.30x = 105,423.36 × 42,405.81
4. Step 4: Simplify right side
   76,397.30x = 4,470,562,973.72
5. Step 5: Solve for x
   x = 4,470,562,973.72/76,397.30
6. Step 6: Final answer
   x = 58,517.29