Finding the Fourth Proportional to 2,083.42, 3,126.67 and 987.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,083.42 : 3,126.67 = 987.78 : x
2. Step 2: Convert to fraction form
   2,083.42/3,126.67 = 987.78/x
3. Step 3: Cross multiply
   2,083.42x = 3,126.67 × 987.78
4. Step 4: Simplify right side
   2,083.42x = 3,088,457.15
5. Step 5: Solve for x
   x = 3,088,457.15/2,083.42
6. Step 6: Final answer
   x = 1,482.40