Finding the Fourth Proportional to 69,042.40, 103,640.40 and 42,776.80

Step by Step Solution

1. Step 1: Write the proportion equation
   69,042.40 : 103,640.40 = 42,776.80 : x
2. Step 2: Convert to fraction form
   69,042.40/103,640.40 = 42,776.80/x
3. Step 3: Cross multiply
   69,042.40x = 103,640.40 × 42,776.80
4. Step 4: Simplify right side
   69,042.40x = 4,433,404,662.72
5. Step 5: Solve for x
   x = 4,433,404,662.72/69,042.40
6. Step 6: Final answer
   x = 64,212.78