Finding the Fourth Proportional to 139,040.64, 208,613.16 and 64,196.64

Step by Step Solution

1. Step 1: Write the proportion equation
   139,040.64 : 208,613.16 = 64,196.64 : x
2. Step 2: Convert to fraction form
   139,040.64/208,613.16 = 64,196.64/x
3. Step 3: Cross multiply
   139,040.64x = 208,613.16 × 64,196.64
4. Step 4: Simplify right side
   139,040.64x = 13,392,263,931.78
5. Step 5: Solve for x
   x = 13,392,263,931.78/139,040.64
6. Step 6: Final answer
   x = 96,319.06