Finding the Fourth Proportional to 115,196.70, 158,966.34 and 64,215

Step by Step Solution

1. Step 1: Write the proportion equation
   115,196.70 : 158,966.34 = 64,215 : x
2. Step 2: Convert to fraction form
   115,196.70/158,966.34 = 64,215/x
3. Step 3: Cross multiply
   115,196.70x = 158,966.34 × 64,215
4. Step 4: Simplify right side
   115,196.70x = 10,208,023,523.10
5. Step 5: Solve for x
   x = 10,208,023,523.10/115,196.70
6. Step 6: Final answer
   x = 88,613.85