Finding the Fourth Proportional to 1,342.78, 1,853.06 and 876.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,342.78 : 1,853.06 = 876.76 : x
2. Step 2: Convert to fraction form
   1,342.78/1,853.06 = 876.76/x
3. Step 3: Cross multiply
   1,342.78x = 1,853.06 × 876.76
4. Step 4: Simplify right side
   1,342.78x = 1,624,688.89
5. Step 5: Solve for x
   x = 1,624,688.89/1,342.78
6. Step 6: Final answer
   x = 1,209.94