Finding the Fourth Proportional to 76,789.30, 105,977.81 and 42,800.89

Step by Step Solution

1. Step 1: Write the proportion equation
   76,789.30 : 105,977.81 = 42,800.89 : x
2. Step 2: Convert to fraction form
   76,789.30/105,977.81 = 42,800.89/x
3. Step 3: Cross multiply
   76,789.30x = 105,977.81 × 42,800.89
4. Step 4: Simplify right side
   76,789.30x = 4,535,944,588.25
5. Step 5: Solve for x
   x = 4,535,944,588.25/76,789.30
6. Step 6: Final answer
   x = 59,070.01