Finding the Fourth Proportional to 128,271.50, 177,011.37 and 71,683.34

Step by Step Solution

1. Step 1: Write the proportion equation
   128,271.50 : 177,011.37 = 71,683.34 : x
2. Step 2: Convert to fraction form
   128,271.50/177,011.37 = 71,683.34/x
3. Step 3: Cross multiply
   128,271.50x = 177,011.37 × 71,683.34
4. Step 4: Simplify right side
   128,271.50x = 12,688,766,219.58
5. Step 5: Solve for x
   x = 12,688,766,219.58/128,271.50
6. Step 6: Final answer
   x = 98,921.17