Finding the Fourth Proportional to 1,988.71, 2,981.04 and 892.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,988.71 : 2,981.04 = 892.78 : x
2. Step 2: Convert to fraction form
   1,988.71/2,981.04 = 892.78/x
3. Step 3: Cross multiply
   1,988.71x = 2,981.04 × 892.78
4. Step 4: Simplify right side
   1,988.71x = 2,661,412.89
5. Step 5: Solve for x
   x = 2,661,412.89/1,988.71
6. Step 6: Final answer
   x = 1,338.26