Finding the Fourth Proportional to 1,577.39, 2,176.83 and 869.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,577.39 : 2,176.83 = 869.22 : x
2. Step 2: Convert to fraction form
   1,577.39/2,176.83 = 869.22/x
3. Step 3: Cross multiply
   1,577.39x = 2,176.83 × 869.22
4. Step 4: Simplify right side
   1,577.39x = 1,892,144.17
5. Step 5: Solve for x
   x = 1,892,144.17/1,577.39
6. Step 6: Final answer
   x = 1,199.54