Finding the Third Proportional to 358,045.50 and 780,000

Step by Step Solution

1. Step 1: Write the proportion equation
   358,045.50 : 780,000 = 780,000 : x
2. Step 2: Convert to fraction form
   358,045.50/780,000 = 780,000/x
3. Step 3: Cross multiply
   358,045.50x = 780,000 × 780,000
4. Step 4: Simplify right side
   358,045.50x = 608,400,000,000
5. Step 5: Solve for x
   x = 608,400,000,000/358,045.50
6. Step 6: Final answer
   x = 1,699,225.38