Finding the Fourth Proportional to 256,133, 384,230.18 and 78,616.76

Step by Step Solution

1. Step 1: Write the proportion equation
   256,133 : 384,230.18 = 78,616.76 : x
2. Step 2: Convert to fraction form
   256,133/384,230.18 = 78,616.76/x
3. Step 3: Cross multiply
   256,133x = 384,230.18 × 78,616.76
4. Step 4: Simplify right side
   256,133x = 30,206,931,845.82
5. Step 5: Solve for x
   x = 30,206,931,845.82/256,133
6. Step 6: Final answer
   x = 117,934.56