Finding the Fourth Proportional to 1,986.77, 2,978.45 and 875.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,986.77 : 2,978.45 = 875.34 : x
2. Step 2: Convert to fraction form
   1,986.77/2,978.45 = 875.34/x
3. Step 3: Cross multiply
   1,986.77x = 2,978.45 × 875.34
4. Step 4: Simplify right side
   1,986.77x = 2,607,152.05
5. Step 5: Solve for x
   x = 2,607,152.05/1,986.77
6. Step 6: Final answer
   x = 1,312.26