Finding the Fourth Proportional to 65,623.71, 90,567.53 and 40,147.05

Step by Step Solution

1. Step 1: Write the proportion equation
   65,623.71 : 90,567.53 = 40,147.05 : x
2. Step 2: Convert to fraction form
   65,623.71/90,567.53 = 40,147.05/x
3. Step 3: Cross multiply
   65,623.71x = 90,567.53 × 40,147.05
4. Step 4: Simplify right side
   65,623.71x = 3,636,019,105.10
5. Step 5: Solve for x
   x = 3,636,019,105.10/65,623.71
6. Step 6: Final answer
   x = 55,407.09