Finding the Fourth Proportional to 1,359.90, 1,876.98 and 770.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.90 : 1,876.98 = 770.63 : x
2. Step 2: Convert to fraction form
   1,359.90/1,876.98 = 770.63/x
3. Step 3: Cross multiply
   1,359.90x = 1,876.98 × 770.63
4. Step 4: Simplify right side
   1,359.90x = 1,446,447.71
5. Step 5: Solve for x
   x = 1,446,447.71/1,359.90
6. Step 6: Final answer
   x = 1,063.64