Finding the Fourth Proportional to 76,789.78, 105,968.28 and 42,798.10

Step by Step Solution

1. Step 1: Write the proportion equation
   76,789.78 : 105,968.28 = 42,798.10 : x
2. Step 2: Convert to fraction form
   76,789.78/105,968.28 = 42,798.10/x
3. Step 3: Cross multiply
   76,789.78x = 105,968.28 × 42,798.10
4. Step 4: Simplify right side
   76,789.78x = 4,535,241,044.27
5. Step 5: Solve for x
   x = 4,535,241,044.27/76,789.78
6. Step 6: Final answer
   x = 59,060.48