Finding the Fourth Proportional to 131,005.89, 196,489.71 and 64,428.15

Step by Step Solution

1. Step 1: Write the proportion equation
   131,005.89 : 196,489.71 = 64,428.15 : x
2. Step 2: Convert to fraction form
   131,005.89/196,489.71 = 64,428.15/x
3. Step 3: Cross multiply
   131,005.89x = 196,489.71 × 64,428.15
4. Step 4: Simplify right side
   131,005.89x = 12,659,468,509.34
5. Step 5: Solve for x
   x = 12,659,468,509.34/131,005.89
6. Step 6: Final answer
   x = 96,632.82