Finding the Third Proportional to 187,638.19 and 399,061.69

Step by Step Solution

1. Step 1: Write the proportion equation
   187,638.19 : 399,061.69 = 399,061.69 : x
2. Step 2: Convert to fraction form
   187,638.19/399,061.69 = 399,061.69/x
3. Step 3: Cross multiply
   187,638.19x = 399,061.69 × 399,061.69
4. Step 4: Simplify right side
   187,638.19x = 159,250,230,430.35
5. Step 5: Solve for x
   x = 159,250,230,430.35/187,638.19
6. Step 6: Final answer
   x = 848,709.06