Finding the Fourth Proportional to 2,100.21, 3,151.32 and 930.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.21 : 3,151.32 = 930.07 : x
2. Step 2: Convert to fraction form
   2,100.21/3,151.32 = 930.07/x
3. Step 3: Cross multiply
   2,100.21x = 3,151.32 × 930.07
4. Step 4: Simplify right side
   2,100.21x = 2,930,948.19
5. Step 5: Solve for x
   x = 2,930,948.19/2,100.21
6. Step 6: Final answer
   x = 1,395.55