Finding the Fourth Proportional to 1,985.72, 2,740.35 and 1,089.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,985.72 : 2,740.35 = 1,089.50 : x
2. Step 2: Convert to fraction form
   1,985.72/2,740.35 = 1,089.50/x
3. Step 3: Cross multiply
   1,985.72x = 2,740.35 × 1,089.50
4. Step 4: Simplify right side
   1,985.72x = 2,985,611.33
5. Step 5: Solve for x
   x = 2,985,611.33/1,985.72
6. Step 6: Final answer
   x = 1,503.54