Finding the Fourth Proportional to 256,100.68, 353,404.65 and 142,930.72

Step by Step Solution

1. Step 1: Write the proportion equation
   256,100.68 : 353,404.65 = 142,930.72 : x
2. Step 2: Convert to fraction form
   256,100.68/353,404.65 = 142,930.72/x
3. Step 3: Cross multiply
   256,100.68x = 353,404.65 × 142,930.72
4. Step 4: Simplify right side
   256,100.68x = 50,512,381,075.85
5. Step 5: Solve for x
   x = 50,512,381,075.85/256,100.68
6. Step 6: Final answer
   x = 197,236.42