Finding the Fourth Proportional to 1,377.02, 1,900.98 and 1,128.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.02 : 1,900.98 = 1,128.89 : x
2. Step 2: Convert to fraction form
   1,377.02/1,900.98 = 1,128.89/x
3. Step 3: Cross multiply
   1,377.02x = 1,900.98 × 1,128.89
4. Step 4: Simplify right side
   1,377.02x = 2,145,987.81
5. Step 5: Solve for x
   x = 2,145,987.81/1,377.02
6. Step 6: Final answer
   x = 1,558.43