Finding the Third Proportional to 189,429.89 and 405,126.56

Step by Step Solution

1. Step 1: Write the proportion equation
   189,429.89 : 405,126.56 = 405,126.56 : x
2. Step 2: Convert to fraction form
   189,429.89/405,126.56 = 405,126.56/x
3. Step 3: Cross multiply
   189,429.89x = 405,126.56 × 405,126.56
4. Step 4: Simplify right side
   189,429.89x = 164,127,531,643.07
5. Step 5: Solve for x
   x = 164,127,531,643.07/189,429.89
6. Step 6: Final answer
   x = 866,428.90