Finding the Third Proportional to 549,870 and 851,400

Step by Step Solution

1. Step 1: Write the proportion equation
   549,870 : 851,400 = 851,400 : x
2. Step 2: Convert to fraction form
   549,870/851,400 = 851,400/x
3. Step 3: Cross multiply
   549,870x = 851,400 × 851,400
4. Step 4: Simplify right side
   549,870x = 724,881,960,000
5. Step 5: Solve for x
   x = 724,881,960,000/549,870
6. Step 6: Final answer
   x = 1,318,278.79