Finding the Fourth Proportional to 1,459.90, 2,186.54 and 1,128.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,459.90 : 2,186.54 = 1,128.50 : x
2. Step 2: Convert to fraction form
   1,459.90/2,186.54 = 1,128.50/x
3. Step 3: Cross multiply
   1,459.90x = 2,186.54 × 1,128.50
4. Step 4: Simplify right side
   1,459.90x = 2,467,524.89
5. Step 5: Solve for x
   x = 2,467,524.89/1,459.90
6. Step 6: Final answer
   x = 1,690.21