Finding the Fourth Proportional to 1,342.84, 1,851.40 and 869.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,342.84 : 1,851.40 = 869.92 : x
2. Step 2: Convert to fraction form
   1,342.84/1,851.40 = 869.92/x
3. Step 3: Cross multiply
   1,342.84x = 1,851.40 × 869.92
4. Step 4: Simplify right side
   1,342.84x = 1,610,569.89
5. Step 5: Solve for x
   x = 1,610,569.89/1,342.84
6. Step 6: Final answer
   x = 1,199.38