Finding the Fourth Proportional to 1,401.23, 2,100.17 and 620.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.23 : 2,100.17 = 620.35 : x
2. Step 2: Convert to fraction form
   1,401.23/2,100.17 = 620.35/x
3. Step 3: Cross multiply
   1,401.23x = 2,100.17 × 620.35
4. Step 4: Simplify right side
   1,401.23x = 1,302,836.76
5. Step 5: Solve for x
   x = 1,302,836.76/1,401.23
6. Step 6: Final answer
   x = 929.78