Finding the Fourth Proportional to 1,677.52, 2,315.00 and 978.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,677.52 : 2,315.00 = 978.89 : x
2. Step 2: Convert to fraction form
   1,677.52/2,315.00 = 978.89/x
3. Step 3: Cross multiply
   1,677.52x = 2,315.00 × 978.89
4. Step 4: Simplify right side
   1,677.52x = 2,266,138.58
5. Step 5: Solve for x
   x = 2,266,138.58/1,677.52
6. Step 6: Final answer
   x = 1,350.89