Finding the Fourth Proportional to 31,472.55, 43,430.18 and 28,964.79

Step by Step Solution

1. Step 1: Write the proportion equation
   31,472.55 : 43,430.18 = 28,964.79 : x
2. Step 2: Convert to fraction form
   31,472.55/43,430.18 = 28,964.79/x
3. Step 3: Cross multiply
   31,472.55x = 43,430.18 × 28,964.79
4. Step 4: Simplify right side
   31,472.55x = 1,257,945,898.54
5. Step 5: Solve for x
   x = 1,257,945,898.54/31,472.55
6. Step 6: Final answer
   x = 39,969.62