Finding the Fourth Proportional to 65,931.12, 90,985.05 and 39,086.82

Step by Step Solution

1. Step 1: Write the proportion equation
   65,931.12 : 90,985.05 = 39,086.82 : x
2. Step 2: Convert to fraction form
   65,931.12/90,985.05 = 39,086.82/x
3. Step 3: Cross multiply
   65,931.12x = 90,985.05 × 39,086.82
4. Step 4: Simplify right side
   65,931.12x = 3,556,316,272.04
5. Step 5: Solve for x
   x = 3,556,316,272.04/65,931.12
6. Step 6: Final answer
   x = 53,939.87