Finding the Fourth Proportional to 127,128.78, 175,437.54 and 69,768.42

Step by Step Solution

1. Step 1: Write the proportion equation
   127,128.78 : 175,437.54 = 69,768.42 : x
2. Step 2: Convert to fraction form
   127,128.78/175,437.54 = 69,768.42/x
3. Step 3: Cross multiply
   127,128.78x = 175,437.54 × 69,768.42
4. Step 4: Simplify right side
   127,128.78x = 12,239,999,974.49
5. Step 5: Solve for x
   x = 12,239,999,974.49/127,128.78
6. Step 6: Final answer
   x = 96,280.32