Finding the Fourth Proportional to 76,779.57, 105,955.91 and 42,787.31

Step by Step Solution

1. Step 1: Write the proportion equation
   76,779.57 : 105,955.91 = 42,787.31 : x
2. Step 2: Convert to fraction form
   76,779.57/105,955.91 = 42,787.31/x
3. Step 3: Cross multiply
   76,779.57x = 105,955.91 × 42,787.31
4. Step 4: Simplify right side
   76,779.57x = 4,533,568,578.91
5. Step 5: Solve for x
   x = 4,533,568,578.91/76,779.57
6. Step 6: Final answer
   x = 59,046.55