Finding the Fourth Proportional to 1,686.83, 2,326.88 and 988.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,686.83 : 2,326.88 = 988.07 : x
2. Step 2: Convert to fraction form
   1,686.83/2,326.88 = 988.07/x
3. Step 3: Cross multiply
   1,686.83x = 2,326.88 × 988.07
4. Step 4: Simplify right side
   1,686.83x = 2,299,111.16
5. Step 5: Solve for x
   x = 2,299,111.16/1,686.83
6. Step 6: Final answer
   x = 1,362.98