Finding the Fourth Proportional to 1,345.86, 1,858.28 and 822.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,345.86 : 1,858.28 = 822.60 : x
2. Step 2: Convert to fraction form
   1,345.86/1,858.28 = 822.60/x
3. Step 3: Cross multiply
   1,345.86x = 1,858.28 × 822.60
4. Step 4: Simplify right side
   1,345.86x = 1,528,617.02
5. Step 5: Solve for x
   x = 1,528,617.02/1,345.86
6. Step 6: Final answer
   x = 1,135.79