Finding the Fourth Proportional to 140,758.81, 210,990.59 and 65,815.79

Step by Step Solution

1. Step 1: Write the proportion equation
   140,758.81 : 210,990.59 = 65,815.79 : x
2. Step 2: Convert to fraction form
   140,758.81/210,990.59 = 65,815.79/x
3. Step 3: Cross multiply
   140,758.81x = 210,990.59 × 65,815.79
4. Step 4: Simplify right side
   140,758.81x = 13,886,510,979.38
5. Step 5: Solve for x
   x = 13,886,510,979.38/140,758.81
6. Step 6: Final answer
   x = 98,654.65