Finding the Fourth Proportional to 1,986.18, 2,978.22 and 875.14

Step by Step Solution

1. Step 1: Write the proportion equation
   1,986.18 : 2,978.22 = 875.14 : x
2. Step 2: Convert to fraction form
   1,986.18/2,978.22 = 875.14/x
3. Step 3: Cross multiply
   1,986.18x = 2,978.22 × 875.14
4. Step 4: Simplify right side
   1,986.18x = 2,606,359.45
5. Step 5: Solve for x
   x = 2,606,359.45/1,986.18
6. Step 6: Final answer
   x = 1,312.25