Finding the Fourth Proportional to 105,890.50, 146,128.89 and 61,178.50

Step by Step Solution

1. Step 1: Write the proportion equation
   105,890.50 : 146,128.89 = 61,178.50 : x
2. Step 2: Convert to fraction form
   105,890.50/146,128.89 = 61,178.50/x
3. Step 3: Cross multiply
   105,890.50x = 146,128.89 × 61,178.50
4. Step 4: Simplify right side
   105,890.50x = 8,939,946,296.87
5. Step 5: Solve for x
   x = 8,939,946,296.87/105,890.50
6. Step 6: Final answer
   x = 84,426.33