Finding the Fourth Proportional to 1,985.72, 2,739.50 and 1,277.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,985.72 : 2,739.50 = 1,277.43 : x
2. Step 2: Convert to fraction form
   1,985.72/2,739.50 = 1,277.43/x
3. Step 3: Cross multiply
   1,985.72x = 2,739.50 × 1,277.43
4. Step 4: Simplify right side
   1,985.72x = 3,499,513.10
5. Step 5: Solve for x
   x = 3,499,513.10/1,985.72
6. Step 6: Final answer
   x = 1,762.34