Finding the Third Proportional to 503,820 and 780,070.50

Step by Step Solution

1. Step 1: Write the proportion equation
   503,820 : 780,070.50 = 780,070.50 : x
2. Step 2: Convert to fraction form
   503,820/780,070.50 = 780,070.50/x
3. Step 3: Cross multiply
   503,820x = 780,070.50 × 780,070.50
4. Step 4: Simplify right side
   503,820x = 608,509,984,970.25
5. Step 5: Solve for x
   x = 608,509,984,970.25/503,820
6. Step 6: Final answer
   x = 1,207,792.44