Finding the Fourth Proportional to 256,537.78, 384,889.71 and 123,400.72

Step by Step Solution

1. Step 1: Write the proportion equation
   256,537.78 : 384,889.71 = 123,400.72 : x
2. Step 2: Convert to fraction form
   256,537.78/384,889.71 = 123,400.72/x
3. Step 3: Cross multiply
   256,537.78x = 384,889.71 × 123,400.72
4. Step 4: Simplify right side
   256,537.78x = 47,495,667,334.59
5. Step 5: Solve for x
   x = 47,495,667,334.59/256,537.78
6. Step 6: Final answer
   x = 185,141.02