Finding the Fourth Proportional to 65,488.68, 90,376.20 and 38,628.72

Step by Step Solution

1. Step 1: Write the proportion equation
   65,488.68 : 90,376.20 = 38,628.72 : x
2. Step 2: Convert to fraction form
   65,488.68/90,376.20 = 38,628.72/x
3. Step 3: Cross multiply
   65,488.68x = 90,376.20 × 38,628.72
4. Step 4: Simplify right side
   65,488.68x = 3,491,116,924.46
5. Step 5: Solve for x
   x = 3,491,116,924.46/65,488.68
6. Step 6: Final answer
   x = 53,308.71