Finding the Fourth Proportional to 129,030.27, 178,059.39 and 71,667.31

Step by Step Solution

1. Step 1: Write the proportion equation
   129,030.27 : 178,059.39 = 71,667.31 : x
2. Step 2: Convert to fraction form
   129,030.27/178,059.39 = 71,667.31/x
3. Step 3: Cross multiply
   129,030.27x = 178,059.39 × 71,667.31
4. Step 4: Simplify right side
   129,030.27x = 12,761,036,822.27
5. Step 5: Solve for x
   x = 12,761,036,822.27/129,030.27
6. Step 6: Final answer
   x = 98,899.56