Finding the Fourth Proportional to 85,680.34, 118,401.53 and 64,422.70

Step by Step Solution

1. Step 1: Write the proportion equation
   85,680.34 : 118,401.53 = 64,422.70 : x
2. Step 2: Convert to fraction form
   85,680.34/118,401.53 = 64,422.70/x
3. Step 3: Cross multiply
   85,680.34x = 118,401.53 × 64,422.70
4. Step 4: Simplify right side
   85,680.34x = 7,627,745,628.61
5. Step 5: Solve for x
   x = 7,627,745,628.61/85,680.34
6. Step 6: Final answer
   x = 89,025.63