Finding the Third Proportional to 355,816 and 784,531.50

Step by Step Solution

1. Step 1: Write the proportion equation
   355,816 : 784,531.50 = 784,531.50 : x
2. Step 2: Convert to fraction form
   355,816/784,531.50 = 784,531.50/x
3. Step 3: Cross multiply
   355,816x = 784,531.50 × 784,531.50
4. Step 4: Simplify right side
   355,816x = 615,489,674,492.25
5. Step 5: Solve for x
   x = 615,489,674,492.25/355,816
6. Step 6: Final answer
   x = 1,729,797.63