Finding the Fourth Proportional to 1,985.90, 2,740.50 and 1,101.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,985.90 : 2,740.50 = 1,101.68 : x
2. Step 2: Convert to fraction form
   1,985.90/2,740.50 = 1,101.68/x
3. Step 3: Cross multiply
   1,985.90x = 2,740.50 × 1,101.68
4. Step 4: Simplify right side
   1,985.90x = 3,019,150.61
5. Step 5: Solve for x
   x = 3,019,150.61/1,985.90
6. Step 6: Final answer
   x = 1,520.30