Finding the Fourth Proportional to 69,055.40, 103,659.90 and 42,789.80

Step by Step Solution

1. Step 1: Write the proportion equation
   69,055.40 : 103,659.90 = 42,789.80 : x
2. Step 2: Convert to fraction form
   69,055.40/103,659.90 = 42,789.80/x
3. Step 3: Cross multiply
   69,055.40x = 103,659.90 × 42,789.80
4. Step 4: Simplify right side
   69,055.40x = 4,435,586,389.02
5. Step 5: Solve for x
   x = 4,435,586,389.02/69,055.40
6. Step 6: Final answer
   x = 64,232.29