Finding the Third Proportional to 402,408 and 878,536.13

Step by Step Solution

1. Step 1: Write the proportion equation
   402,408 : 878,536.13 = 878,536.13 : x
2. Step 2: Convert to fraction form
   402,408/878,536.13 = 878,536.13/x
3. Step 3: Cross multiply
   402,408x = 878,536.13 × 878,536.13
4. Step 4: Simplify right side
   402,408x = 771,825,722,930.02
5. Step 5: Solve for x
   x = 771,825,722,930.02/402,408
6. Step 6: Final answer
   x = 1,918,017.84