Finding the Fourth Proportional to 65,284.88, 89,506.40 and 64,103.90

Step by Step Solution

1. Step 1: Write the proportion equation
   65,284.88 : 89,506.40 = 64,103.90 : x
2. Step 2: Convert to fraction form
   65,284.88/89,506.40 = 64,103.90/x
3. Step 3: Cross multiply
   65,284.88x = 89,506.40 × 64,103.90
4. Step 4: Simplify right side
   65,284.88x = 5,737,708,546.91
5. Step 5: Solve for x
   x = 5,737,708,546.91/65,284.88
6. Step 6: Final answer
   x = 87,887.26