Finding the Fourth Proportional to 2,128.96, 3,188.80 and 1,153

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.96 : 3,188.80 = 1,153 : x
2. Step 2: Convert to fraction form
   2,128.96/3,188.80 = 1,153/x
3. Step 3: Cross multiply
   2,128.96x = 3,188.80 × 1,153
4. Step 4: Simplify right side
   2,128.96x = 3,676,686.40
5. Step 5: Solve for x
   x = 3,676,686.40/2,128.96
6. Step 6: Final answer
   x = 1,726.99