Finding the Fourth Proportional to 1,917.05, 2,877.15 and 992.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,917.05 : 2,877.15 = 992.89 : x
2. Step 2: Convert to fraction form
   1,917.05/2,877.15 = 992.89/x
3. Step 3: Cross multiply
   1,917.05x = 2,877.15 × 992.89
4. Step 4: Simplify right side
   1,917.05x = 2,856,700.78
5. Step 5: Solve for x
   x = 2,856,700.78/1,917.05
6. Step 6: Final answer
   x = 1,490.15