Finding the Fourth Proportional to 65,200.42, 89,978.79 and 36,521.31

Step by Step Solution

1. Step 1: Write the proportion equation
   65,200.42 : 89,978.79 = 36,521.31 : x
2. Step 2: Convert to fraction form
   65,200.42/89,978.79 = 36,521.31/x
3. Step 3: Cross multiply
   65,200.42x = 89,978.79 × 36,521.31
4. Step 4: Simplify right side
   65,200.42x = 3,286,143,100.41
5. Step 5: Solve for x
   x = 3,286,143,100.41/65,200.42
6. Step 6: Final answer
   x = 50,400.65