Finding the Fourth Proportional to 1,377.90, 1,900.20 and 904.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.90 : 1,900.20 = 904.96 : x
2. Step 2: Convert to fraction form
   1,377.90/1,900.20 = 904.96/x
3. Step 3: Cross multiply
   1,377.90x = 1,900.20 × 904.96
4. Step 4: Simplify right side
   1,377.90x = 1,719,600.47
5. Step 5: Solve for x
   x = 1,719,600.47/1,377.90
6. Step 6: Final answer
   x = 1,247.99