Finding the Fourth Proportional to 66,629.42, 91,939.72 and 42,788.39

Step by Step Solution

1. Step 1: Write the proportion equation
   66,629.42 : 91,939.72 = 42,788.39 : x
2. Step 2: Convert to fraction form
   66,629.42/91,939.72 = 42,788.39/x
3. Step 3: Cross multiply
   66,629.42x = 91,939.72 × 42,788.39
4. Step 4: Simplify right side
   66,629.42x = 3,933,952,595.85
5. Step 5: Solve for x
   x = 3,933,952,595.85/66,629.42
6. Step 6: Final answer
   x = 59,042.28