Finding the Fourth Proportional to 1,411.98, 2,117.94 and 385.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,411.98 : 2,117.94 = 385.98 : x
2. Step 2: Convert to fraction form
   1,411.98/2,117.94 = 385.98/x
3. Step 3: Cross multiply
   1,411.98x = 2,117.94 × 385.98
4. Step 4: Simplify right side
   1,411.98x = 817,482.48
5. Step 5: Solve for x
   x = 817,482.48/1,411.98
6. Step 6: Final answer
   x = 578.96