Finding the Fourth Proportional to 42,729.81, 58,883.90 and 30,770.57

Step by Step Solution

1. Step 1: Write the proportion equation
   42,729.81 : 58,883.90 = 30,770.57 : x
2. Step 2: Convert to fraction form
   42,729.81/58,883.90 = 30,770.57/x
3. Step 3: Cross multiply
   42,729.81x = 58,883.90 × 30,770.57
4. Step 4: Simplify right side
   42,729.81x = 1,811,890,718.55
5. Step 5: Solve for x
   x = 1,811,890,718.55/42,729.81
6. Step 6: Final answer
   x = 42,403.43