Finding the Fourth Proportional to 76,660, 105,790.92 and 42,665.92

Step by Step Solution

1. Step 1: Write the proportion equation
   76,660 : 105,790.92 = 42,665.92 : x
2. Step 2: Convert to fraction form
   76,660/105,790.92 = 42,665.92/x
3. Step 3: Cross multiply
   76,660x = 105,790.92 × 42,665.92
4. Step 4: Simplify right side
   76,660x = 4,513,666,929.45
5. Step 5: Solve for x
   x = 4,513,666,929.45/76,660
6. Step 6: Final answer
   x = 58,879.04