Finding the Third Proportional to 189,432 and 405,129.94

Step by Step Solution

1. Step 1: Write the proportion equation
   189,432 : 405,129.94 = 405,129.94 : x
2. Step 2: Convert to fraction form
   189,432/405,129.94 = 405,129.94/x
3. Step 3: Cross multiply
   189,432x = 405,129.94 × 405,129.94
4. Step 4: Simplify right side
   189,432x = 164,130,266,258.75
5. Step 5: Solve for x
   x = 164,130,266,258.75/189,432
6. Step 6: Final answer
   x = 866,433.69