Finding the Fourth Proportional to 1,539.50, 2,124.53 and 840.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,539.50 : 2,124.53 = 840.89 : x
2. Step 2: Convert to fraction form
   1,539.50/2,124.53 = 840.89/x
3. Step 3: Cross multiply
   1,539.50x = 2,124.53 × 840.89
4. Step 4: Simplify right side
   1,539.50x = 1,786,491.83
5. Step 5: Solve for x
   x = 1,786,491.83/1,539.50
6. Step 6: Final answer
   x = 1,160.44