Finding the Fourth Proportional to 115,196.64, 158,970.72 and 64,209.60

Step by Step Solution

1. Step 1: Write the proportion equation
   115,196.64 : 158,970.72 = 64,209.60 : x
2. Step 2: Convert to fraction form
   115,196.64/158,970.72 = 64,209.60/x
3. Step 3: Cross multiply
   115,196.64x = 158,970.72 × 64,209.60
4. Step 4: Simplify right side
   115,196.64x = 10,207,446,342.91
5. Step 5: Solve for x
   x = 10,207,446,342.91/115,196.64
6. Step 6: Final answer
   x = 88,608.89