Finding the Fourth Proportional to 1,139.59, 1,701.62 and 999.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.59 : 1,701.62 = 999.73 : x
2. Step 2: Convert to fraction form
   1,139.59/1,701.62 = 999.73/x
3. Step 3: Cross multiply
   1,139.59x = 1,701.62 × 999.73
4. Step 4: Simplify right side
   1,139.59x = 1,701,160.56
5. Step 5: Solve for x
   x = 1,701,160.56/1,139.59
6. Step 6: Final answer
   x = 1,492.78