Finding the Fourth Proportional to 65,686.50, 90,647.73 and 35,878.50

Step by Step Solution

1. Step 1: Write the proportion equation
   65,686.50 : 90,647.73 = 35,878.50 : x
2. Step 2: Convert to fraction form
   65,686.50/90,647.73 = 35,878.50/x
3. Step 3: Cross multiply
   65,686.50x = 90,647.73 × 35,878.50
4. Step 4: Simplify right side
   65,686.50x = 3,252,304,580.81
5. Step 5: Solve for x
   x = 3,252,304,580.81/65,686.50
6. Step 6: Final answer
   x = 49,512.53