Finding the Fourth Proportional to 1,699.57, 2,345.31 and 991.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,699.57 : 2,345.31 = 991.53 : x
2. Step 2: Convert to fraction form
   1,699.57/2,345.31 = 991.53/x
3. Step 3: Cross multiply
   1,699.57x = 2,345.31 × 991.53
4. Step 4: Simplify right side
   1,699.57x = 2,325,445.22
5. Step 5: Solve for x
   x = 2,325,445.22/1,699.57
6. Step 6: Final answer
   x = 1,368.26