Finding the Third Proportional to 290,077.50 and 435,258

Step by Step Solution

1. Step 1: Write the proportion equation
   290,077.50 : 435,258 = 435,258 : x
2. Step 2: Convert to fraction form
   290,077.50/435,258 = 435,258/x
3. Step 3: Cross multiply
   290,077.50x = 435,258 × 435,258
4. Step 4: Simplify right side
   290,077.50x = 189,449,526,564
5. Step 5: Solve for x
   x = 189,449,526,564/290,077.50
6. Step 6: Final answer
   x = 653,099.69