Finding the Fourth Proportional to 47,688.30, 65,789.31 and 28,814.50

Step by Step Solution

1. Step 1: Write the proportion equation
   47,688.30 : 65,789.31 = 28,814.50 : x
2. Step 2: Convert to fraction form
   47,688.30/65,789.31 = 28,814.50/x
3. Step 3: Cross multiply
   47,688.30x = 65,789.31 × 28,814.50
4. Step 4: Simplify right side
   47,688.30x = 1,895,686,073.00
5. Step 5: Solve for x
   x = 1,895,686,073.00/47,688.30
6. Step 6: Final answer
   x = 39,751.60