Finding the Fourth Proportional to 105,384.54, 145,432.83 and 57,640.98

Step by Step Solution

1. Step 1: Write the proportion equation
   105,384.54 : 145,432.83 = 57,640.98 : x
2. Step 2: Convert to fraction form
   105,384.54/145,432.83 = 57,640.98/x
3. Step 3: Cross multiply
   105,384.54x = 145,432.83 × 57,640.98
4. Step 4: Simplify right side
   105,384.54x = 8,382,890,845.37
5. Step 5: Solve for x
   x = 8,382,890,845.37/105,384.54
6. Step 6: Final answer
   x = 79,545.74