Finding the Fourth Proportional to 1,401.84, 2,097.36 and 1,128.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.84 : 2,097.36 = 1,128.60 : x
2. Step 2: Convert to fraction form
   1,401.84/2,097.36 = 1,128.60/x
3. Step 3: Cross multiply
   1,401.84x = 2,097.36 × 1,128.60
4. Step 4: Simplify right side
   1,401.84x = 2,367,080.50
5. Step 5: Solve for x
   x = 2,367,080.50/1,401.84
6. Step 6: Final answer
   x = 1,688.55