Finding the Third Proportional to 187,531.50 and 390,609

Step by Step Solution

1. Step 1: Write the proportion equation
   187,531.50 : 390,609 = 390,609 : x
2. Step 2: Convert to fraction form
   187,531.50/390,609 = 390,609/x
3. Step 3: Cross multiply
   187,531.50x = 390,609 × 390,609
4. Step 4: Simplify right side
   187,531.50x = 152,575,390,881
5. Step 5: Solve for x
   x = 152,575,390,881/187,531.50
6. Step 6: Final answer
   x = 813,598.73