Finding the Fourth Proportional to 1,359.72, 1,876.50 and 770.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.72 : 1,876.50 = 770.45 : x
2. Step 2: Convert to fraction form
   1,359.72/1,876.50 = 770.45/x
3. Step 3: Cross multiply
   1,359.72x = 1,876.50 × 770.45
4. Step 4: Simplify right side
   1,359.72x = 1,445,740.04
5. Step 5: Solve for x
   x = 1,445,740.04/1,359.72
6. Step 6: Final answer
   x = 1,063.26