Finding the Fourth Proportional to 2,913.84, 4,020.72 and 1,866

Step by Step Solution

1. Step 1: Write the proportion equation
   2,913.84 : 4,020.72 = 1,866 : x
2. Step 2: Convert to fraction form
   2,913.84/4,020.72 = 1,866/x
3. Step 3: Cross multiply
   2,913.84x = 4,020.72 × 1,866
4. Step 4: Simplify right side
   2,913.84x = 7,502,663.52
5. Step 5: Solve for x
   x = 7,502,663.52/2,913.84
6. Step 6: Final answer
   x = 2,574.84