Finding the Fourth Proportional to 56,790.50, 78,369.96 and 30,949.40

Step by Step Solution

1. Step 1: Write the proportion equation
   56,790.50 : 78,369.96 = 30,949.40 : x
2. Step 2: Convert to fraction form
   56,790.50/78,369.96 = 30,949.40/x
3. Step 3: Cross multiply
   56,790.50x = 78,369.96 × 30,949.40
4. Step 4: Simplify right side
   56,790.50x = 2,425,503,240.02
5. Step 5: Solve for x
   x = 2,425,503,240.02/56,790.50
6. Step 6: Final answer
   x = 42,709.67