Finding the Fourth Proportional to 66,429.48, 91,620.78 and 42,558.42

Step by Step Solution

1. Step 1: Write the proportion equation
   66,429.48 : 91,620.78 = 42,558.42 : x
2. Step 2: Convert to fraction form
   66,429.48/91,620.78 = 42,558.42/x
3. Step 3: Cross multiply
   66,429.48x = 91,620.78 × 42,558.42
4. Step 4: Simplify right side
   66,429.48x = 3,899,235,635.97
5. Step 5: Solve for x
   x = 3,899,235,635.97/66,429.48
6. Step 6: Final answer
   x = 58,697.37