Finding the Fourth Proportional to 1,359.90, 1,876.86 and 770.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.90 : 1,876.86 = 770.58 : x
2. Step 2: Convert to fraction form
   1,359.90/1,876.86 = 770.58/x
3. Step 3: Cross multiply
   1,359.90x = 1,876.86 × 770.58
4. Step 4: Simplify right side
   1,359.90x = 1,446,270.78
5. Step 5: Solve for x
   x = 1,446,270.78/1,359.90
6. Step 6: Final answer
   x = 1,063.51