Finding the Fourth Proportional to 256,667.70, 385,045.20 and 79,141.62

Step by Step Solution

1. Step 1: Write the proportion equation
   256,667.70 : 385,045.20 = 79,141.62 : x
2. Step 2: Convert to fraction form
   256,667.70/385,045.20 = 79,141.62/x
3. Step 3: Cross multiply
   256,667.70x = 385,045.20 × 79,141.62
4. Step 4: Simplify right side
   256,667.70x = 30,473,100,901.22
5. Step 5: Solve for x
   x = 30,473,100,901.22/256,667.70
6. Step 6: Final answer
   x = 118,725.89