Finding the Third Proportional to 359,485.50 and 780,079.50

Step by Step Solution

1. Step 1: Write the proportion equation
   359,485.50 : 780,079.50 = 780,079.50 : x
2. Step 2: Convert to fraction form
   359,485.50/780,079.50 = 780,079.50/x
3. Step 3: Cross multiply
   359,485.50x = 780,079.50 × 780,079.50
4. Step 4: Simplify right side
   359,485.50x = 608,524,026,320.25
5. Step 5: Solve for x
   x = 608,524,026,320.25/359,485.50
6. Step 6: Final answer
   x = 1,692,763.76