Finding the Third Proportional to 402,436 and 852,840

Step by Step Solution

1. Step 1: Write the proportion equation
   402,436 : 852,840 = 852,840 : x
2. Step 2: Convert to fraction form
   402,436/852,840 = 852,840/x
3. Step 3: Cross multiply
   402,436x = 852,840 × 852,840
4. Step 4: Simplify right side
   402,436x = 727,336,065,600
5. Step 5: Solve for x
   x = 727,336,065,600/402,436
6. Step 6: Final answer
   x = 1,807,333.50