Finding the Third Proportional to 388,225.50 and 830,421

Step by Step Solution

1. Step 1: Write the proportion equation
   388,225.50 : 830,421 = 830,421 : x
2. Step 2: Convert to fraction form
   388,225.50/830,421 = 830,421/x
3. Step 3: Cross multiply
   388,225.50x = 830,421 × 830,421
4. Step 4: Simplify right side
   388,225.50x = 689,599,037,241
5. Step 5: Solve for x
   x = 689,599,037,241/388,225.50
6. Step 6: Final answer
   x = 1,776,284.76