Finding the Fourth Proportional to 85,139.29, 127,665.21 and 45,729.55

Step by Step Solution

1. Step 1: Write the proportion equation
   85,139.29 : 127,665.21 = 45,729.55 : x
2. Step 2: Convert to fraction form
   85,139.29/127,665.21 = 45,729.55/x
3. Step 3: Cross multiply
   85,139.29x = 127,665.21 × 45,729.55
4. Step 4: Simplify right side
   85,139.29x = 5,838,072,603.96
5. Step 5: Solve for x
   x = 5,838,072,603.96/85,139.29
6. Step 6: Final answer
   x = 68,570.84