Finding the Fourth Proportional to 76,656.39, 105,789.30 and 42,667.05

Step by Step Solution

1. Step 1: Write the proportion equation
   76,656.39 : 105,789.30 = 42,667.05 : x
2. Step 2: Convert to fraction form
   76,656.39/105,789.30 = 42,667.05/x
3. Step 3: Cross multiply
   76,656.39x = 105,789.30 × 42,667.05
4. Step 4: Simplify right side
   76,656.39x = 4,513,717,352.57
5. Step 5: Solve for x
   x = 4,513,717,352.57/76,656.39
6. Step 6: Final answer
   x = 58,882.47