Finding the Fourth Proportional to 1,249.76, 1,871.72 and 988.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,249.76 : 1,871.72 = 988.01 : x
2. Step 2: Convert to fraction form
   1,249.76/1,871.72 = 988.01/x
3. Step 3: Cross multiply
   1,249.76x = 1,871.72 × 988.01
4. Step 4: Simplify right side
   1,249.76x = 1,849,268.72
5. Step 5: Solve for x
   x = 1,849,268.72/1,249.76
6. Step 6: Final answer
   x = 1,479.70