Finding the Fourth Proportional to 76,779.82, 105,956.25 and 42,787.56

Step by Step Solution

1. Step 1: Write the proportion equation
   76,779.82 : 105,956.25 = 42,787.56 : x
2. Step 2: Convert to fraction form
   76,779.82/105,956.25 = 42,787.56/x
3. Step 3: Cross multiply
   76,779.82x = 105,956.25 × 42,787.56
4. Step 4: Simplify right side
   76,779.82x = 4,533,609,404.25
5. Step 5: Solve for x
   x = 4,533,609,404.25/76,779.82
6. Step 6: Final answer
   x = 59,046.89