Finding the Fourth Proportional to 1,375.50, 1,898.17 and 777.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,375.50 : 1,898.17 = 777.99 : x
2. Step 2: Convert to fraction form
   1,375.50/1,898.17 = 777.99/x
3. Step 3: Cross multiply
   1,375.50x = 1,898.17 × 777.99
4. Step 4: Simplify right side
   1,375.50x = 1,476,743.90
5. Step 5: Solve for x
   x = 1,476,743.90/1,375.50
6. Step 6: Final answer
   x = 1,073.61