Finding the Fourth Proportional to 1,588.56, 2,191.56 and 998.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,588.56 : 2,191.56 = 998.06 : x
2. Step 2: Convert to fraction form
   1,588.56/2,191.56 = 998.06/x
3. Step 3: Cross multiply
   1,588.56x = 2,191.56 × 998.06
4. Step 4: Simplify right side
   1,588.56x = 2,187,308.37
5. Step 5: Solve for x
   x = 2,187,308.37/1,588.56
6. Step 6: Final answer
   x = 1,376.91