Finding the Fourth Proportional to 76,659.72, 105,789.34 and 42,669.64

Step by Step Solution

1. Step 1: Write the proportion equation
   76,659.72 : 105,789.34 = 42,669.64 : x
2. Step 2: Convert to fraction form
   76,659.72/105,789.34 = 42,669.64/x
3. Step 3: Cross multiply
   76,659.72x = 105,789.34 × 42,669.64
4. Step 4: Simplify right side
   76,659.72x = 4,513,993,053.64
5. Step 5: Solve for x
   x = 4,513,993,053.64/76,659.72
6. Step 6: Final answer
   x = 58,883.51