Finding the Fourth Proportional to 65,488.50, 90,374.13 and 35,680.50

Step by Step Solution

1. Step 1: Write the proportion equation
   65,488.50 : 90,374.13 = 35,680.50 : x
2. Step 2: Convert to fraction form
   65,488.50/90,374.13 = 35,680.50/x
3. Step 3: Cross multiply
   65,488.50x = 90,374.13 × 35,680.50
4. Step 4: Simplify right side
   65,488.50x = 3,224,594,145.47
5. Step 5: Solve for x
   x = 3,224,594,145.47/65,488.50
6. Step 6: Final answer
   x = 49,239.09