Finding the Third Proportional to 40,123.50 and 85,431

Step by Step Solution

1. Step 1: Write the proportion equation
   40,123.50 : 85,431 = 85,431 : x
2. Step 2: Convert to fraction form
   40,123.50/85,431 = 85,431/x
3. Step 3: Cross multiply
   40,123.50x = 85,431 × 85,431
4. Step 4: Simplify right side
   40,123.50x = 7,298,455,761
5. Step 5: Solve for x
   x = 7,298,455,761/40,123.50
6. Step 6: Final answer
   x = 181,899.78