Finding the Fourth Proportional to 76,386.54, 105,406.41 and 42,394.49

Step by Step Solution

1. Step 1: Write the proportion equation
   76,386.54 : 105,406.41 = 42,394.49 : x
2. Step 2: Convert to fraction form
   76,386.54/105,406.41 = 42,394.49/x
3. Step 3: Cross multiply
   76,386.54x = 105,406.41 × 42,394.49
4. Step 4: Simplify right side
   76,386.54x = 4,468,651,021.90
5. Step 5: Solve for x
   x = 4,468,651,021.90/76,386.54
6. Step 6: Final answer
   x = 58,500.50