Finding the Fourth Proportional to 2,719.02, 4,080.14 and 987.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,719.02 : 4,080.14 = 987.78 : x
2. Step 2: Convert to fraction form
   2,719.02/4,080.14 = 987.78/x
3. Step 3: Cross multiply
   2,719.02x = 4,080.14 × 987.78
4. Step 4: Simplify right side
   2,719.02x = 4,030,280.69
5. Step 5: Solve for x
   x = 4,030,280.69/2,719.02
6. Step 6: Final answer
   x = 1,482.25