Finding the Fourth Proportional to 810,128.72, 1,214,136.12 and 586,243.28

Step by Step Solution

1. Step 1: Write the proportion equation
   810,128.72 : 1,214,136.12 = 586,243.28 : x
2. Step 2: Convert to fraction form
   810,128.72/1,214,136.12 = 586,243.28/x
3. Step 3: Cross multiply
   810,128.72x = 1,214,136.12 × 586,243.28
4. Step 4: Simplify right side
   810,128.72x = 711,779,141,355.27
5. Step 5: Solve for x
   x = 711,779,141,355.27/810,128.72
6. Step 6: Final answer
   x = 878,600.06