Finding the Fourth Proportional to 65,215.08, 89,650.32 and 56,106.96

Step by Step Solution

1. Step 1: Write the proportion equation
   65,215.08 : 89,650.32 = 56,106.96 : x
2. Step 2: Convert to fraction form
   65,215.08/89,650.32 = 56,106.96/x
3. Step 3: Cross multiply
   65,215.08x = 89,650.32 × 56,106.96
4. Step 4: Simplify right side
   65,215.08x = 5,030,006,918.23
5. Step 5: Solve for x
   x = 5,030,006,918.23/65,215.08
6. Step 6: Final answer
   x = 77,129.51