Finding the Fourth Proportional to 1,515.96, 2,092.37 and 991.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,515.96 : 2,092.37 = 991.71 : x
2. Step 2: Convert to fraction form
   1,515.96/2,092.37 = 991.71/x
3. Step 3: Cross multiply
   1,515.96x = 2,092.37 × 991.71
4. Step 4: Simplify right side
   1,515.96x = 2,075,019.29
5. Step 5: Solve for x
   x = 2,075,019.29/1,515.96
6. Step 6: Final answer
   x = 1,368.78