Finding the Fourth Proportional to 585,061.10, 821,447.50 and 585,061.10

Step by Step Solution

1. Step 1: Write the proportion equation
   585,061.10 : 821,447.50 = 585,061.10 : x
2. Step 2: Convert to fraction form
   585,061.10/821,447.50 = 585,061.10/x
3. Step 3: Cross multiply
   585,061.10x = 821,447.50 × 585,061.10
4. Step 4: Simplify right side
   585,061.10x = 480,596,977,942.25
5. Step 5: Solve for x
   x = 480,596,977,942.25/585,061.10
6. Step 6: Final answer
   x = 821,447.50