Finding the Fourth Proportional to 1,377.07, 1,900.15 and 817.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.07 : 1,900.15 = 817.56 : x
2. Step 2: Convert to fraction form
   1,377.07/1,900.15 = 817.56/x
3. Step 3: Cross multiply
   1,377.07x = 1,900.15 × 817.56
4. Step 4: Simplify right side
   1,377.07x = 1,553,479.84
5. Step 5: Solve for x
   x = 1,553,479.84/1,377.07
6. Step 6: Final answer
   x = 1,128.11