Finding the Fourth Proportional to 76,671.18, 105,803.55 and 42,678.54

Step by Step Solution

1. Step 1: Write the proportion equation
   76,671.18 : 105,803.55 = 42,678.54 : x
2. Step 2: Convert to fraction form
   76,671.18/105,803.55 = 42,678.54/x
3. Step 3: Cross multiply
   76,671.18x = 105,803.55 × 42,678.54
4. Step 4: Simplify right side
   76,671.18x = 4,515,541,040.82
5. Step 5: Solve for x
   x = 4,515,541,040.82/76,671.18
6. Step 6: Final answer
   x = 58,894.89