Finding the Third Proportional to 54,331 and 85,870.50

Step by Step Solution

1. Step 1: Write the proportion equation
   54,331 : 85,870.50 = 85,870.50 : x
2. Step 2: Convert to fraction form
   54,331/85,870.50 = 85,870.50/x
3. Step 3: Cross multiply
   54,331x = 85,870.50 × 85,870.50
4. Step 4: Simplify right side
   54,331x = 7,373,742,770.25
5. Step 5: Solve for x
   x = 7,373,742,770.25/54,331
6. Step 6: Final answer
   x = 135,718.89