Finding the Fourth Proportional to 131,456.40, 197,314.20 and 64,971.60

Step by Step Solution

1. Step 1: Write the proportion equation
   131,456.40 : 197,314.20 = 64,971.60 : x
2. Step 2: Convert to fraction form
   131,456.40/197,314.20 = 64,971.60/x
3. Step 3: Cross multiply
   131,456.40x = 197,314.20 × 64,971.60
4. Step 4: Simplify right side
   131,456.40x = 12,819,819,276.72
5. Step 5: Solve for x
   x = 12,819,819,276.72/131,456.40
6. Step 6: Final answer
   x = 97,521.45