Finding the Fourth Proportional to 501,105.78, 751,702.38 and 127,128.78

Step by Step Solution

1. Step 1: Write the proportion equation
   501,105.78 : 751,702.38 = 127,128.78 : x
2. Step 2: Convert to fraction form
   501,105.78/751,702.38 = 127,128.78/x
3. Step 3: Cross multiply
   501,105.78x = 751,702.38 × 127,128.78
4. Step 4: Simplify right side
   501,105.78x = 95,563,006,492.50
5. Step 5: Solve for x
   x = 95,563,006,492.50/501,105.78
6. Step 6: Final answer
   x = 190,704.26