Finding the Fourth Proportional to 82,878.18, 114,415.22 and 64,689.90

Step by Step Solution

1. Step 1: Write the proportion equation
   82,878.18 : 114,415.22 = 64,689.90 : x
2. Step 2: Convert to fraction form
   82,878.18/114,415.22 = 64,689.90/x
3. Step 3: Cross multiply
   82,878.18x = 114,415.22 × 64,689.90
4. Step 4: Simplify right side
   82,878.18x = 7,401,509,140.28
5. Step 5: Solve for x
   x = 7,401,509,140.28/82,878.18
6. Step 6: Final answer
   x = 89,305.88