Finding the Fourth Proportional to 56,923.42, 78,555.56 and 31,431.40

Step by Step Solution

1. Step 1: Write the proportion equation
   56,923.42 : 78,555.56 = 31,431.40 : x
2. Step 2: Convert to fraction form
   56,923.42/78,555.56 = 31,431.40/x
3. Step 3: Cross multiply
   56,923.42x = 78,555.56 × 31,431.40
4. Step 4: Simplify right side
   56,923.42x = 2,469,111,559.98
5. Step 5: Solve for x
   x = 2,469,111,559.98/56,923.42
6. Step 6: Final answer
   x = 43,376.02