Finding the Fourth Proportional to 2,085.78, 3,128.70 and 625.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.78 : 3,128.70 = 625.02 : x
2. Step 2: Convert to fraction form
   2,085.78/3,128.70 = 625.02/x
3. Step 3: Cross multiply
   2,085.78x = 3,128.70 × 625.02
4. Step 4: Simplify right side
   2,085.78x = 1,955,500.07
5. Step 5: Solve for x
   x = 1,955,500.07/2,085.78
6. Step 6: Final answer
   x = 937.54