Finding the Fourth Proportional to 1,885.01, 2,600.78 and 1,128.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,885.01 : 2,600.78 = 1,128.47 : x
2. Step 2: Convert to fraction form
   1,885.01/2,600.78 = 1,128.47/x
3. Step 3: Cross multiply
   1,885.01x = 2,600.78 × 1,128.47
4. Step 4: Simplify right side
   1,885.01x = 2,934,911.53
5. Step 5: Solve for x
   x = 2,934,911.53/1,885.01
6. Step 6: Final answer
   x = 1,556.98