Finding the Fourth Proportional to 76,789.06, 105,977.52 and 42,800.65

Step by Step Solution

1. Step 1: Write the proportion equation
   76,789.06 : 105,977.52 = 42,800.65 : x
2. Step 2: Convert to fraction form
   76,789.06/105,977.52 = 42,800.65/x
3. Step 3: Cross multiply
   76,789.06x = 105,977.52 × 42,800.65
4. Step 4: Simplify right side
   76,789.06x = 4,535,906,211.50
5. Step 5: Solve for x
   x = 4,535,906,211.50/76,789.06
6. Step 6: Final answer
   x = 59,069.70