Finding the Fourth Proportional to 76,770.88, 105,943.56 and 42,780.82

Step by Step Solution

1. Step 1: Write the proportion equation
   76,770.88 : 105,943.56 = 42,780.82 : x
2. Step 2: Convert to fraction form
   76,770.88/105,943.56 = 42,780.82/x
3. Step 3: Cross multiply
   76,770.88x = 105,943.56 × 42,780.82
4. Step 4: Simplify right side
   76,770.88x = 4,532,352,370.52
5. Step 5: Solve for x
   x = 4,532,352,370.52/76,770.88
6. Step 6: Final answer
   x = 59,037.39