Finding the Fourth Proportional to 1,530.76, 2,112.92 and 978.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,530.76 : 2,112.92 = 978.76 : x
2. Step 2: Convert to fraction form
   1,530.76/2,112.92 = 978.76/x
3. Step 3: Cross multiply
   1,530.76x = 2,112.92 × 978.76
4. Step 4: Simplify right side
   1,530.76x = 2,068,041.58
5. Step 5: Solve for x
   x = 2,068,041.58/1,530.76
6. Step 6: Final answer
   x = 1,350.99