Finding the Fourth Proportional to 131,008.55, 196,493.63 and 64,430.78

Step by Step Solution

1. Step 1: Write the proportion equation
   131,008.55 : 196,493.63 = 64,430.78 : x
2. Step 2: Convert to fraction form
   131,008.55/196,493.63 = 64,430.78/x
3. Step 3: Cross multiply
   131,008.55x = 196,493.63 × 64,430.78
4. Step 4: Simplify right side
   131,008.55x = 12,660,236,541.31
5. Step 5: Solve for x
   x = 12,660,236,541.31/131,008.55
6. Step 6: Final answer
   x = 96,636.72