Finding the Fourth Proportional to 1,108.52, 1,530.30 and 778.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,108.52 : 1,530.30 = 778.70 : x
2. Step 2: Convert to fraction form
   1,108.52/1,530.30 = 778.70/x
3. Step 3: Cross multiply
   1,108.52x = 1,530.30 × 778.70
4. Step 4: Simplify right side
   1,108.52x = 1,191,644.61
5. Step 5: Solve for x
   x = 1,191,644.61/1,108.52
6. Step 6: Final answer
   x = 1,074.99