Finding the Fourth Proportional to 76,780.82, 105,957.63 and 42,788.56

Step by Step Solution

1. Step 1: Write the proportion equation
   76,780.82 : 105,957.63 = 42,788.56 : x
2. Step 2: Convert to fraction form
   76,780.82/105,957.63 = 42,788.56/x
3. Step 3: Cross multiply
   76,780.82x = 105,957.63 × 42,788.56
4. Step 4: Simplify right side
   76,780.82x = 4,533,774,408.71
5. Step 5: Solve for x
   x = 4,533,774,408.71/76,780.82
6. Step 6: Final answer
   x = 59,048.27