Finding the Third Proportional to 619,405.50 and 902,143.50

Step by Step Solution

1. Step 1: Write the proportion equation
   619,405.50 : 902,143.50 = 902,143.50 : x
2. Step 2: Convert to fraction form
   619,405.50/902,143.50 = 902,143.50/x
3. Step 3: Cross multiply
   619,405.50x = 902,143.50 × 902,143.50
4. Step 4: Simplify right side
   619,405.50x = 813,862,894,592.25
5. Step 5: Solve for x
   x = 813,862,894,592.25/619,405.50
6. Step 6: Final answer
   x = 1,313,941.99