Finding the Fourth Proportional to 127,978.56, 176,614.26 and 71,388.72

Step by Step Solution

1. Step 1: Write the proportion equation
   127,978.56 : 176,614.26 = 71,388.72 : x
2. Step 2: Convert to fraction form
   127,978.56/176,614.26 = 71,388.72/x
3. Step 3: Cross multiply
   127,978.56x = 176,614.26 × 71,388.72
4. Step 4: Simplify right side
   127,978.56x = 12,608,265,955.15
5. Step 5: Solve for x
   x = 12,608,265,955.15/127,978.56
6. Step 6: Final answer
   x = 98,518.58